Fix a missing .h and change the recommended include for the POSIX2008 functions from xlocale.h to locale.h. Including xlocale.h is for legacy / Darwin compatibility so should not be encouraged.
load of _l suffixed versions of various standard library functions that use
the global locale, making them take an explicit locale parameter. Also
adds support for per-thread locales. This work was funded by the FreeBSD
Foundation.
Please test any code you have that uses the C standard locale functions!
Reviewed by: das (gdtoa changes)
Approved by: dim (mentor)