package/enscript: Fix build with gcc 15.x

Fixes:
https://autobuild.buildroot.net/results/7fd/7fdda216e2ec57b9bcc1d2613b6546db35a29749/

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/enscript/0002-enscript-c23.patch

@@ -0,0 +1,19 @@
+Fix build with gcc 15.x
+
+Upstream: https://savannah.gnu.org/bugs/?66845
+
+Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
+
+diff --git a/compat/regex.c b/compat/regex.c
+index c6907f3..87f2840 100644
+--- a/compat/regex.c
++++ b/compat/regex.c
+@@ -336,7 +336,7 @@ typedef char boolean;
+ #define false 0
+ #define true 1
+ 
+-static int re_match_2_internal ();
++static int re_match_2_internal (struct re_pattern_buffer*, const char*, int, const char*, int, int, struct re_registers*, int);
+ 
+ /* These are the command codes that appear in compiled regular
+    expressions.  Some opcodes are followed by argument bytes.  A