Lua module - how to not include Lua core? - gcc

Question

I need to build this Lua module and to be able to use it in another application that already has Lua core included. Module will be loaded via 'require'.
I'm using MinGW x64 on Windows 10. I successfully built Lua 5.2 with it, extracted lua.dll file and renamed it into liblua.dll.a.
Then I built the module using following Makefile:
CC = x86_64-w64-mingw32-gcc
LUA_INCDIR=$(STAGING_DIR)/usr/include
utf8.dll: lutf8lib.o
$(CC) -m64 -O -shared -fpic lutf8lib.c -o utf8.dll -llua
lutf8lib.o: lutf8lib.c
$(CC) -O2 -fpic -c -DLUA_BUILD_AS_DLL lutf8lib.c -I$(LUA_INCDIR)
The problem is file size, it's 420kb and it definetely includes Lua core (I got 'multiple VMs' error). I need to build the module without including the core.
Previously I installed usual MinGW (x86) and used following Makefile:
CC = gcc
LUA_INCDIR=$(STAGING_DIR)/usr/include
utf8.dll: lutf8lib.o
$(CC) -m32 -shared lutf8lib.c -o utf8.dll -llua
lutf8lib.o: lutf8lib.c
$(CC) -fPIC -c lutf8lib.c -I$(LUA_INCDIR)
And got 97kb file without Lua core. Unfortunately I specifically need x64 file.
UPD: I tried to build the same module using MSVC, but it seems that IDE changes luaopen_utf8 function name. If I'll add this to fix it:
int __declspec(dllexport)
IDE will include Lua core VM into DLL file. Again.