This function can be used for all GetInfo() items, so using it is
simpler than the code in the Unix version of wxLocale::GetInfo() which
uses either it or localeconv(), and there should be no real drawbacks to
using it nowadays as it should be available everywhere.
No real changes yet.
This is tidier than using #ifdefs in the same common file and also
ensures that initializing wxLocale affects wxUILocale too, which will be
important for compatibility when the code elsewhere is modified to use
wxUILocale::GetInfo() instead of wxLocale::GetInfo() in the upcoming
commits.
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