Revert "Update lua plugin to 5.2.3"

FILE typedef to *void needs more work to not break sim and
application builds. I checked only a few random native builds
unfortunately. Sorry for inconvenience.

apps/plugins/lua/rocklib.h

@@ -25,7 +25,6 @@
 #define LUA_ROCKLIBNAME	"rb"
 LUALIB_API int (luaopen_rock) (lua_State *L);
 const char* get_current_path(lua_State *L, int level);
-int rli_checkboolean (lua_State *L, int narg);
 
 #endif /* _ROCKLIB_H_ */