xdgmime: Add continue statements after goto labels in_xdg_mime_(cache_)mime_type_subclass

To fix the Android build.

gio/xdgmime/xdgmime.c

@@ -894,6 +894,7 @@ _xdg_mime_mime_type_subclass (const char *mime,
         }
 
     next_parent:
+      continue;
     }
 
 done:

gio/xdgmime/xdgmimecache.c

@@ -989,7 +989,8 @@ _xdg_mime_cache_mime_type_subclass (const char *mime,
 		      goto done;
 		    }
 
-	        next_parent:
+		next_parent:
+		  continue;
 		}
 
 	      break;