After some mistakes i made on this port last days, i hop^W believe this is the
last commit.

The original problem is port was broken on amd64 when you have CFLAGS= defined
on make.conf. On last commit i thought it was fixed, but no, i don't know why
but it was building without define LUA_USE_LINUX and the binary generated was
wrong.

I figured out just using GMAKE fixes everything, it respect CFLAGS= when you
have, add -fPIC for amd64 and use correct defines for building, so, lets use
gmake to build this port for now.

Pointyhats to: garga@