[Rpm-maint] [rpm-software-management/rpm] Define shell to use with $() (#1334)

[Brian J. Murrell]

It would be nice to be able to define which shell should be used with `%()` given that `/bin/sh` is not the same shell on all distros.  Additionally having to write `$()` macros to the lowest common denominator is just ugly.  It's much nicer to just make _bash_ a `BuildRequires:` and be able to write bashisms in`%$()`.  Particularly given that most(?) distros do use bash for `/bin/sh` and only a few outliers don't.

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