[PATCH v1 8/12] PPC64: Add libmvec SIMD single-precision logarithm function.

[GT]

This patch creates a vector logf implementation of the algorithm in
sysdeps/ieee754/flt-32. The specific reference algorithm version is from
commit #bf27d3973d. Three files are adapted as follows:

math_config.h becomes sysdeps/powerpc/powerpc64/fpu/multiarch/math_config_flt.h
e_logf_data.c becomes sysdeps/powerpc/powerpc64/fpu/multiarch/vec_s_logf_data.c
e_logf.c becomes sysdeps/powerpc/powerpc64/fpu/multiarch/vec_s_logf4_vsx.c.
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