[Rpm-maint] [rpm-software-management/rpm] %_build_cpu is untranslated in macros file (#791)

[Michael Schroeder]

Commit d53499d1565dd7ba6d93939e552cc604b26dccd7 makes rpmbuild use %_build_cpu instead of %_target_cpu for valid architecture testing if the target_cpu is noarch.

On most architecture this works well, but there are cases with unexpected results. Our ppc64le rpm has _host_cpu and thus _build_cpu set to "powerpc64le". But users expect
```
ExclusiveArch: ppc64le
```
to work, it currently returns `error: Architecture is not included: powerpc64le`.

There are two ways to fix this:
1) We can change the configure script so that the _host_cpu value is translated. This would also "fix" the _target_cpu setting that is also done in the file, because _target_cpu needs also to be translated.

2) We can change the rpmReadConfigFiles() code so that it adds a _build_cpu_translated macro and use that in the valid arch check.

Which solution do you prefer?


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