gvpe: fix build with glibc 2.26

Tracking issue: #31696

pkgs/tools/networking/gvpe/default.nix

@@ -9,6 +9,8 @@ stdenv.mkDerivation rec {
     sha256 = "1v61mj25iyd91z0ir7cmradkkcm1ffbk52c96v293ibsvjs2s2hf";
   };
 
+  patches = [ ./gvpe-3.0-glibc-2.26.patch ];
+
   buildInputs = [ openssl gmp zlib ];
 
   configureFlags = [

pkgs/tools/networking/gvpe/gvpe-3.0-glibc-2.26.patch

@@ -0,0 +1,18 @@
+diff --git a/lib/getopt.h b/lib/getopt.h
+index 2d02142..5e7d8d4 100644
+--- a/lib/getopt.h
++++ b/lib/getopt.h
+@@ -101,13 +101,6 @@ struct option
+ #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__ */
+-#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,