- library: check symbol->primary for escape sequences also

- GUI: error message GS1_MODE -> GS1 mode
- GUI: sequence window: fix initial clear button status
- GUI: make acceptable for macOS; add iconset for macOS, install
- manual: update macOS Homebrew install info; add README.macos
- GUI: export window: add no. of sequences to results label

getopt/getopt.c

@@ -392,6 +392,8 @@ _getopt_initialize (int argc, char *const *argv, const char *optstring)
     }
   else
     nonoption_flags_len = 0;
+#else
+  (void)argc; (void)argv;
 #endif
 
   return optstring;