lib/locale.t: Typo in comment
lib/locale.t: Pass AIX failures

Some AIX locales call a no-break space "graphic".  Rather than fail AIX
for this, this commit adopts the same approach used for MSWin, which
similarly has most locales containing some errors.  And that is to pass
it if any locales at all are correct.  Ideally the vendors wouldn't make
broken locales, but this allows us to test for full legality on other
systems.
perlio.h: Indent nested #if

I found this helpful in tracking down an issue, being able to
conveniently pair an #endif with its corresponding #if.  The rest of the
file could stand this sort of treatment, but not from me now.