Fix compile warning in mime.c.

Author: tritao

binmodules/luasocket/src/mime.c

@@ -689,6 +689,7 @@ static size_t dot(int c, size_t state, luaL_Buffer *buffer)
         case '.':
             if (state == 2)
                 luaL_addchar(buffer, '.');
+            // fall through
         default:
             return 0;
     }