Don't unconditionally run love.jitsetup when love is used as a library

src/love.cpp

@@ -165,7 +165,7 @@ static DoneAction runlove(int argc, char **argv, int &retval)
 
  // LuaJIT-specific setup needs to be done as early as possible - before
  // get_app_arguments because that loads external library code. This is also
- // loaded inside require("love"). Note that it doesn't use the love table.
+ // loaded inside love's Lua threads. Note that it doesn't use the love table.
  love_preload(L, luaopen_love_jitsetup, "love.jitsetup");
  lua_getglobal(L, "require");
  lua_pushstring(L, "love.jitsetup");

src/modules/love/love.cpp

@@ -410,11 +410,6 @@ int luaopen_love(lua_State *L)
  for (int i = 0; modules[i].name != nullptr; i++)
  love::luax_preload(L, modules[i].func, modules[i].name);
 
- // jitsetup is also loaded in the love executable runlove function. It's
- // needed here too for threads. Note that it doesn't use the love table.
- love::luax_require(L, "love.jitsetup");
- lua_pop(L, 1);
-
  love::luax_insistpinnedthread(L);
 
  love::luax_insistglobal(L, "love");