remove local getopt_long() implementation

getopt_long() is widely supported these days, removing it from the
source tree should be okay.

Here's documentation or the implementation of getopt_long on many
systems:

All the BSDs:
https://man.netbsd.org/NetBSD-9.2-STABLE/getopt_long.3
https://man.openbsd.org/OpenBSD-7.0/getopt_long
https://www.freebsd.org/cgi/man.cgi?query=getopt_long
https://leaf.dragonflybsd.org/cgi/web-man?command=getopt_long

Illumos (OpenSolaris fork):
https://illumos.org/man/3c/getopt_long

The musl, newlib, and uclibc-ng libcs:
https://gogs.waldemar-brodkorb.de/oss/uclibc-ng/src/master/libc/unistd/getopt_long-simple.c#L49-L52
https://git.musl-libc.org/cgit/musl/tree/src/misc/getopt_long.c#n140
https://sourceware.org/git/?p=newlib-cygwin.git;a=blob;f=newlib/libc/stdlib/getopt.c;h=d4f225a7a735dc741d2874eb6c131b6fce2967c5;hb=HEAD#l475

Mingw-w64:
https://github.com/mirror/mingw-w64/blob/master/mingw-w64-crt/misc/getopt.c#L542-L549

Mac OS X:
https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/getopt_long.3.html

1 files changed, 0 insertions, 130 deletions

diff --git a/src/getopt.h b/src/getopt.h
deleted file mode 100644
index 0a985b0..0000000
--- a/src/getopt.h
+++ /dev/null
@@ -1,130 +0,0 @@
-/* Declarations for getopt.
-   Copyright (C) 1989,90,91,92,93,94,96,97 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public License as
-   published by the Free Software Foundation; either version 2 of the
-   License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public
-   License along with the GNU C Library; see the file COPYING.LIB.  If not,
-   write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
-
-#ifndef _GETOPT_H
-#define _GETOPT_H 1
-
-#ifdef	__cplusplus
-extern "C" {
-#endif
-
-/* For communication from `getopt' to the caller.
-   When `getopt' finds an option that takes an argument,
-   the argument value is returned here.
-   Also, when `ordering' is RETURN_IN_ORDER,
-   each non-option ARGV-element is returned here.  */
-
-	extern char *optarg;
-
-/* Index in ARGV of the next element to be scanned.
-   This is used for communication to and from the caller
-   and for communication between successive calls to `getopt'.
-
-   On entry to `getopt', zero means this is the first call; initialize.
-
-   When `getopt' returns -1, this is the index of the first of the
-   non-option elements that the caller should itself scan.
-
-   Otherwise, `optind' communicates from one call to the next
-   how much of ARGV has been scanned so far.  */
-
-	extern int optind;
-
-/* Callers store zero here to inhibit the error message `getopt' prints
-   for unrecognized options.  */
-
-	extern int opterr;
-
-/* Set to an option character which was unrecognized.  */
-
-	extern int optopt;
-
-/* Describe the long-named options requested by the application.
-   The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
-   of `struct option' terminated by an element containing a name which is
-   zero.
-
-   The field `has_arg' is:
-   no_argument		(or 0) if the option does not take an argument,
-   required_argument	(or 1) if the option requires an argument,
-   optional_argument 	(or 2) if the option takes an optional argument.
-
-   If the field `flag' is not NULL, it points to a variable that is set
-   to the value given in the field `val' when the option is found, but
-   left unchanged if the option is not found.
-
-   To have a long-named option do something other than set an `int' to
-   a compiled-in constant, such as set a value from `optarg', set the
-   option's `flag' field to zero and its `val' field to a nonzero
-   value (the equivalent single-letter option character, if there is
-   one).  For long options that have a zero `flag' field, `getopt'
-   returns the contents of the `val' field.  */
-
-	struct option {
-#if defined (__STDC__) && __STDC__
-		const char *name;
-#else
-		char *name;
-#endif
-		/* has_arg can't be an enum because some compilers complain about type
-		   mismatches in all the code that assumes it is an int.  */
-		int has_arg;
-		int *flag;
-		int val;
-	};
-
-/* Names for the values of the `has_arg' field of `struct option'.  */
-
-#define	no_argument		0
-#define required_argument	1
-#define optional_argument	2
-
-#if defined (__STDC__) && __STDC__
-#ifdef __GNU_LIBRARY__
-/* Many other libraries have conflicting prototypes for getopt, with
-   differences in the consts, in stdlib.h.  To avoid compilation
-   errors, only prototype getopt for the GNU C library.  */
-	extern int getopt(int argc, char *const *argv, const char *shortopts);
-#else				/* not __GNU_LIBRARY__ */
-#ifndef __cplusplus
-/* C++ is more pedantic, and demands a full prototype, not this.
-   Hope that stdlib.h has a prototype for `getopt'.  */
-	extern int getopt();
-#endif				/* __cplusplus */
-#endif				/* __GNU_LIBRARY__ */
-	extern int getopt_long(int argc, char *const *argv,
-			const char *shortopts, const struct option *longopts, int *longind);
-	extern int getopt_long_only(int argc, char *const *argv,
-			const char *shortopts, const struct option *longopts, int *longind);
-
-/* Internal only.  Users should not call this directly.  */
-	extern int _getopt_internal(int argc, char *const *argv,
-			const char *shortopts, const struct option *longopts, int *longind, int long_only);
-#else				/* not __STDC__ */
-	extern int getopt();
-	extern int getopt_long();
-	extern int getopt_long_only();
-
-	extern int _getopt_internal();
-#endif				/* __STDC__ */
-
-#ifdef	__cplusplus
-}
-#endif
-#endif				/* getopt.h */