metal: escape spaces in include path with backslash

src/ext_metal.m

@@ -197,6 +197,8 @@ static int hc_mtlBuildOptionsToDict (void *hashcat_ctx, const char *build_option
   {
     NSString *path_key = @"INCLUDE_PATH";
     NSString *path_value = [NSString stringWithCString: include_path encoding: NSUTF8StringEncoding];
+    // Include path may contain spaces, escape them with a backslash
+    path_value = [path_value stringByReplacingOccurrencesOfString:@" " withString:@"\\ "];
 
     [build_options_dict setObject:path_value forKey:path_key];
   }