lua: add missing forward declaration

Fixes following warning reported by clang-10:

  lua/uci.c:1050:1: error: no previous declaration for ‘luaopen_uci’ [-Werror=missing-declarations]

Signed-off-by: Petr Štetiar <ynezz@true.cz>

1 files changed, 2 insertions, 0 deletions

diff --git a/lua/uci.c b/lua/uci.c
index ecfb299..196a25b 100644
--- a/lua/uci.c
+++ b/lua/uci.c
@@ -36,6 +36,8 @@
 
 #if !defined LUA_VERSION_NUM || LUA_VERSION_NUM==501
 
+int luaopen_uci(lua_State *L);
+
 /*
  * ** Adapted from Lua 5.2.0
  * */