maintainer-feedback requested: [Bug 239162] consolidate arch definitions in graphics/libdrm

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Bug 239162: consolidate arch definitions in graphics/libdrm
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239162



--- Description ---
In various places in the ports tree, tests against ARCH are iterated one-by-one
when a pattern test would be more robust.

This consolidates the tests for arm and powerpc, and in the process, possibly
fixes powerpcspe.  (While the latter is possibly a null case, I am trying to
create a consistent usage across the tree.)