cwen 356f53067e frodo: unbreak with clang on powerpc
CodeWarrior styled asm inline functions are used for powerpc optimisation,
guarded by "__POWERPC__" that base-clang defines, but not base-gcc.
As such, undefine __POWERPC__ to revert the situation as it was when powerpc
was a gcc arch. Runtime tests by Anthony Richardby (thanks!) and me.

OK sthen@
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