[PATCH] Fix signatures for getenv/getopt

GCC-15 complains about missing parameters, this gets found
out when using non-glibc ( e.g. musl ) C library

Fixes
lib/fnmatch.c:124:14: error: conflicting types for 'getenv'; have 'char *(void)'
|   124 | extern char *getenv ();
|       |              ^~~~~~

src/getopt.c: Define parameters of getenv() and getopt().
src/getopt.h: Ditto.
---
 src/getopt.c | 2 +-
 src/getopt.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/getopt.c b/src/getopt.c
index 0c774894..085d3b9b 100644
--- a/src/getopt.c
+++ b/src/getopt.c
@@ -202,7 +202,7 @@ static char *posixly_correct;
    whose names are inconsistent.  */
 
 #ifndef getenv
-extern char *getenv ();
+extern char *getenv (const char *);
 #endif
 
 static char *
diff --git a/src/getopt.h b/src/getopt.h
index cc8ee8dc..a31c91bb 100644
--- a/src/getopt.h
+++ b/src/getopt.h
@@ -102,7 +102,7 @@ struct option
    errors, only prototype getopt for the GNU C library.  */
 extern int getopt (int argc, char *const *argv, const char *shortopts);
 #else /* not __GNU_LIBRARY__ */
-extern int getopt ();
+extern int getopt (int,  char * const*, const char *);
 #endif /* __GNU_LIBRARY__ */
 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
 		        const struct option *longopts, int *longind);