SuSE package changes for x86_64

["Johnny C. Lam" <jlam%pkgsrc.org@localhost>]

I have made some changes to the way that the SuSE packages work.  If
you are using an x86_64 platform, e.g. amd64, then in order to build
the suse100* or suse91* packages for use with COMPAT_LINUX32, then
set EMUL_PLATFORM=linux-i386 when building, e.g.

        # cd pkgsrc/emulators/suse100_base
        # bmake install EMUL_PLATFORM=linux-i386

I will soon commit a set of 32-bit packages that can be used automatically
to satisfy dependencies for 32-bit-only Linux packages.

        Cheers,

        -- Johnny Lam <jlam%pkgsrc.org@localhost>