xC: fix Lua 5.5 build

Everything appears to work, not inspecting this in depth.

CMakeLists.txt

@@ -94,7 +94,8 @@ include_directories (${libffi_INCLUDE_DIRS})
 link_directories (${libffi_LIBRARY_DIRS})
 
 # XXX: other Lua versions may be acceptable, don't know yet
-pkg_search_module (lua lua53 lua5.3 lua-5.3 lua54 lua5.4 lua-5.4 lua>=5.3)
+pkg_search_module (lua
+	lua53 lua5.3 lua-5.3 lua54 lua5.4 lua-5.4 lua55 lua5.5 lua-5.5 lua>=5.3)
 option (WITH_LUA "Enable support for Lua plugins" ${lua_FOUND})
 
 if (WITH_LUA)

NEWS

@@ -1,3 +1,8 @@
+Unreleased
+
+ * xC: added support for Lua 5.5
+
+
 2.2.0 (2026-01-10) "Just Doing the Needful"
 
  * xC: added more characters as nickname delimiters,

xC.c

@@ -11633,7 +11633,11 @@ static struct plugin *
 lua_plugin_load (struct app_context *ctx, const char *filename,
 	struct error **e)
 {
+#if LUA_VERSION_NUM >= 505
+	lua_State *L = lua_newstate (lua_plugin_alloc, NULL, 0);
+#else
 	lua_State *L = lua_newstate (lua_plugin_alloc, NULL);
+#endif
 	if (!L)
 	{
 		error_set (e, "Lua initialization failed");