define no_argument and friends if needed in compat/getopt

desmume/src/libretro-common/include/compat/getopt.h

@@ -60,7 +60,17 @@ extern int optind, opterr, optopt;
 #ifdef __cplusplus
 }
 #endif
+
+/* If these are variously #defined, then we have bigger problems */
+#ifndef no_argument
+   #define no_argument 0
+   #define required_argument 1
+   #define optional_argument 2
 #endif
 
+/* HAVE_GETOPT_LONG */
+#endif
+
+/* pragma once */
 #endif