[Rpm-maint] [rpm-software-management/rpm] is_pentium3 is_pentium4 return bogus values on modern CPUs (Issue #2147)

[Bruno Pitrus]

The function is_pentium3 is_pentium4 in [lib/rpmrc.c](https://github.com/rpm-software-management/rpm/blob/master/lib/rpmrc.c) return false on modern (x64) or non-Intel CPUs, preventing building or installation of RPMs tagged with such an architecture.

I'm guessing that, to be useful, the `pentium3` RPM architecture should correspond to the presence of SSE extensions, and `pentium4` to SSE2 (as it does with [GCC](https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html), for instance), instead of hardcoding specific CPU models.

I also assume that `geode` is 3dNow and `athlon` is Pentium3 with 3dNow — in which case it's [incorrect to make athlon packages installable on x86_64](https://github.com/rpm-software-management/rpm/blob/master/rpmrc.in#L499), as not all 64-bit CPUs have 3dNow (while all have SSE2, for comparison)

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