[RESEND] [PATCH] PPC64: First in the series implementing libmvec on POWER8

[GT]

Differences from previous patch submission:

1. Configure verifies that the compiler implements VSX builtins.
If so vector math library is built by default.

2. A runtime check prevents vector math tests running on systems
lacking VSX hardware.

3. File vec_finite_alias.c is now empty. Its existence ensures
that libmvec_nonshared.a is created. Otherwise, linking during
testing of a newly-installed glibc fails.
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