"Emergency" new version 5.4.6

'lua_resetthread' is back to its original signature, to avoid
incompatibilities in the ABI between releases of the same version.
New function 'lua_closethread' added with the "correct" signature.

ltests.c

@@ -1533,7 +1533,7 @@ static int runC (lua_State *L, lua_State *L1, const char *pc) {
       lua_newthread(L1);
     }
     else if EQ("resetthread") {
-      lua_pushinteger(L1, lua_resetthread(L1, L));
+      lua_pushinteger(L1, lua_resetthread(L1));  /* deprecated */
     }
     else if EQ("newuserdata") {
       lua_newuserdata(L1, getnum);