minidlna: fix linking with libintl if present

Fixes http://autobuild.buildroot.net/results/3b7/3b71243716dc193a11508a69265cdd0120bd13ed



There's unfortunately not any easy way of adding extra libraries to LIBS,
so we need to list them all here.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>