2004-06-13  Manish Singh  <yosh@gimp.org>

        * app/base/cpu-accel.c: Reorged, to address bug #142907 and
        bug #143069. Accel implementations #define HAVE_ACCEL, and cpu_accel()
        keys on that. Both PPC and X86 implementations check for __GNUC__.
        X86 stuff is only used with USE_MMX is defined. The SSE OS check
        is now checked in arch_accel(), not cpu_accel(). Finally, the
        arch x86_64 checks now are EM64T aware (which didn't matter in
        practice).