fix(frontends/lua): make sure Lua 'sleep' function support interruption

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

src/frontends/lua/leanlua_state.cpp

@@ -549,8 +549,7 @@ static int check_interrupted(lua_State *) { // NOLINT
 }
 
 static int sleep(lua_State * L) {
-    std::chrono::milliseconds dura(luaL_checkinteger(L, 1));
-    std::this_thread::sleep_for(dura);
+    sleep_for(luaL_checkinteger(L, 1));
     return 0;
 }
 

tests/lua/threads/sleep1.lua

@@ -0,0 +1,11 @@
+
+S = State()
+T = thread(S, [[
+   sleep(10000)
+]])
+
+T:interrupt()
+local ok, msg = pcall(function() T:wait() end)
+assert(not ok)
+assert(is_exception(msg))
+assert(msg:what() == "interrupted")