[__GO32__]: Don't undef HANDLE_SIGNALS for DJGPP v2.x.

Don't declare sigwinch_set_flag if SIGWINCH is undefined.

readline/signals.c

@@ -40,9 +40,9 @@
 #  include <sys/ioctl.h>
 #endif /* GWINSZ_IN_SYS_IOCTL */
 
-#if defined (__GO32__)
+#if defined (__GO32__) && !defined(__DJGPP__)
 #  undef HANDLE_SIGNALS
-#endif /* __GO32__ */
+#endif /* __GO32__  && !__DJGPP__ */
 
 #if defined (HANDLE_SIGNALS)
 /* Some standard library routines. */
@@ -93,7 +93,9 @@ int rl_catch_sigwinch = 1;
 #endif
 
 static int signals_set_flag;
+#ifdef SIGWINCH
 static int sigwinch_set_flag;
+#endif
 
 /* **************************************************************** */
 /*					        		    */