[Rpm-maint] [rpm-software-management/rpm] Add %toolchain macro to differentiate C/C++ toolchains (#1231)

[tbaederr]

This is often needed when supporting builds with multiple compilers. Simply looking at `%__cc` is not enough since the actual executable might be called differently, but might still be gcc. Or clang.
Doing a substring search is also problematic since "g++" is a substring of "clang++".

So it would be nice if rpm provided a standard macro for this.

Does this make sense for RPM and does `%toolchain` sound fine? If so, I can work on the actual implementation.
It does seem like the value of `%toolchain` would have to be set for every compiler specially though.



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