Three float128 files still include xlocale.h after it was removed. I
don't know why this didn't cause problems for powerpc64le float128
testing; it did cause problems for my x86_64 float128 testing. This
patch changes the includes to use bits/types/locale_t.h.
Tested for x86_64 (in conjunction with float128 patches).
* sysdeps/ieee754/float128/strtof128_l.c: Include
<bits/types/locale_t.h> instead of <xlocale.h>.
* sysdeps/ieee754/float128/wcstof128.c: Likewise.
* sysdeps/ieee754/float128/wcstof128_l.c: Likewise.
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