that does not do the right thing on Darwin (where shared libs are
created with different linking flags and use dylib rather than so
as an extension).
you need to manually reconfigure unix-dll.mak to make it work, so
do it in hacks.mk.
XXX: this still leaves the issue of libgs.so (et al.) being hardwired
in PLIST, instead of using libgs.dylib (et al.). i'm not sure of
the best way to fix that. at least it compiles now....
There actually is an autoconf test in ghostscript for a 64-bit int, used
for GX_COLOR_INDEX_TYPE, but the fallback for that is "ulong", not
necessarily 64 bits. So to make gdevpdfe.c happy for now, force the issue.
