strptime: make %k and %l specifiers match their description in
strftime(3), and allow them to process space-padded input.

PR: 230720
Submitted by: rlittle@inetco.com (original version)
Approved by: kib (mentor, implicit)
Differential Revision: https://reviews.freebsd.org/D17761

Connect libc/tests/time to the build, adding test cases for strptime()
issues fixed recently, and disabling the failing ones (mostly due to TZ
parsing differences with NetBSD).

Reviewed by: ngie
Approved by: kib (mentor)
Differential Revision: https://reviews.freebsd.org/D17546

Mechanically replace #if defined(__FreeBSD__) and #if defined(__NetBSD__) with
their #ifdef equivalents for everything changed in contrib/netbsd-tests. There
are some items from the vendor tree that use #if defined(__FreeBSD__) or
#if defined(__NetBSD__) which are being left alone

Requested by: bde, rpaulo
Sponsored by: EMC / Isilon Storage Division

Change ATF_REQUIRE_MSG calls to ATF_CHECK_MSG to get as many errors as possible

t_strptime:common..
- Expect the testcase body as a whole to fail. Multiple PRs will be filed to
track the issues (there are 18 check failures)

t_strptime:day..
- %EA and %OA seem to be case insensitive on FreeBSD