[tlbuild] luasocket broken on Mac OS X 10.5

[Mojca Miklavec]

I just noticed the following:

In file included from
../../../source/texk/web2c/luatexdir/luasocket/src/socket.c:4:
../../../source/texk/web2c/luatexdir/luasocket/src/usocket.c:441:14:
error: use of undeclared identifier 'EAI_OVERFLOW'
        case EAI_OVERFLOW: return PIE_OVERFLOW;
             ^

See:
    https://github.com/italiangrid/voms/issues/2

I need some time to test.

Mojca