Log Message:
In order to fix PR#30875, do the following things:
 o require at least gcc 3.4 on x86_64, as 3.3 gets an ICE.
 o depends on zlib>=1.2.1, which is povray's requirement, so that the
   package doesn't try to use its own zlib and libtiff (for some reason
   configure fails to configure the provided libs properly when gcc 3.4 is
   used)

Bump PKGREVISION.