s/conform/conforms/

Some serial commas.

We are not NeyBSD.

wcstod(3) is conform to ISO C90 Ammendant1 (FreeBSD's manpage is incorrect...).
don't __weak_alias'ize it and fix manpage.

add c99 wcstof(3) and wcstold(3).
requested by skrll AT netbsd DOT org, thanks.

bump libc minor 138 -> 139.