[PATCH 1/1] fix compilation for ppc64le on musl/Alpine

[Dunk]

musl lacks __ppc_get_timebase() but has __builtin_ppc_get_timebase()

the __ppc_get_timebase_freq() is taken from:
https://git.alpinelinux.org/aports/commit/?id=06b03f70fb94972286c0c9f6278df89e53903833

Signed-off-by: Duncan Bellamy <dunk at denkimushi.com>

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