nethack: fix for gcc-12

srcpkgs/nethack/patches/2-gcc12.patch

@@ -0,0 +1,14 @@
+--- a/include/tradstdc.h
++++ b/include/tradstdc.h
+@@ -431,7 +431,11 @@
+ #define NORETURN __attribute__((noreturn))
+ /* disable gcc's __attribute__((__warn_unused_result__)) since explicitly
+    discarding the result by casting to (void) is not accepted as a 'use' */
++#if __GNUC__ >= 11
++#define __warn_unused_result__ unused
++#elif
+ #define __warn_unused_result__ /*empty*/
++#endif
+ #define warn_unused_result /*empty*/
+ #endif
+ #endif