allow lua multi-implementation
@GENTOO_LUA_VERSION@ will be replaced after sources copied for each lua implementation
--- a/lgi/core.c
+++ b/lgi/core.c
@@ -697,7 +697,7 @@ set_resident (lua_State *L)
 }
 
 G_MODULE_EXPORT int
-luaopen_lgi_corelgilua51 (lua_State* L)
+luaopen_lgi_corelgi@GENTOO_LUA_VERSION@ (lua_State* L)
 {
   LgiStateMutex *mutex;
   gint state_id;
--- a/lgi/core.lua
+++ b/lgi/core.lua
@@ -11,7 +11,7 @@
 -- This module decides what kind of core routines should be loaded.
 -- Currently only one implementation exists, standard-Lua C-side
 -- implementation, LuaJIT-FFI-based one is planned.
-local core = require 'lgi.corelgilua51'
+local core = require 'lgi.corelgi@GENTOO_LUA_VERSION@'
 
 -- Helper methods for converting between CamelCase and uscore_delim
 -- names.
--- a/lgi/meson.build
+++ b/lgi/meson.build
@@ -1,4 +1,4 @@
-liblgi = shared_module('corelgilua51',
+liblgi = shared_module('corelgi@GENTOO_LUA_VERSION@',
   sources: [
     'buffer.c',
     'callable.c',