libuwsc: fix compilation with GCC11

Bad if identation is now an error.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libs/libuwsc/patches/010-gcc11.patch

@@ -0,0 +1,11 @@
+--- a/src/lua/uwsc_lua.c
++++ b/src/lua/uwsc_lua.c
+@@ -177,7 +177,7 @@ static int uwsc_lua_on(lua_State *L)
+     else
+         luaL_argcheck(L, false, 2, "available event name: open message error close");
+ 
+-	return 0;
++    return 0;
+ }
+ 
+ static int __uwsc_lua_send(lua_State *L, int op)