x86-64: Add vector log10/log10f to libmvec microbenchmark

Add vector log10/log10f and input files to libmvec microbenchmark.

libmvec-log10-inputs:
  70% Normal random distribution
  range: (0.0, DBL_MAX)
  mean: 1.0
  sigma: 50.0
  30% uniform random distribution in range (0.0, 1.0e6)

libmvec-log10f-inputs:
  70% Normal random distribution
  range: (0.0f, FLT_MAX)
  mean: 1.0f
  sigma: 50.0f
  30% uniform random distribution in range (0.0f, 1.0e6f)

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

sysdeps/x86_64/fpu/Makeconfig

@@ -65,6 +65,7 @@ libmvec-bench-funcs = \
   expm1 \
   hypot \
   log \
+  log10 \
   pow \
   sin \
   sinh \