Particles lua threads cant access OS functions anymore

src/particles.c

@@ -1043,6 +1043,7 @@ int thread_particles(void *data)
 	pt->L = L;
 	lua_newtable(L);
 	lua_setglobal(L, "__fcts");
+	luaL_dostring(L, "os.execute = nil os.getenv = nil os.remove = nil os.rename = nil");
 	luaL_dostring(L, "function core.shader.allow() return true end");
 
 	// Override "print" if requested