MFC r313378,r313379:

r313378:

Wrap strcmp/wcscmp calls with ATF_CHECK_MSG and drop atf_tc_fail use

The reasoning here was the same as what was done in r313376:

• Gather as many results as possible instead of failing early and not testing the rest of the cases.
• Simplify logic when checking test inputs vs outputs and printing test result.

r313379:

Expect :int_within_limits to fail when ptrdiff_t/*intmax_t differ in base type

The %t{d,u} (ptrdiff_t) tests fail for the following reasons:

• ptrdiff_t is by definition int32_t on !LP64 architectures and int64_t on LP64 architectures.
• intmax_t is by definition fixed to int64_t on all architectures.
• Some of the code in lib/libc/stdio/... is promoting ptrdiff_t to *intmax_t when parsing/representing the value.

PR: 191674