bin/test: Sync with FreeBSD

bin/test: Sync with FreeBSD

-Help /bin/sh pass a few more regression tests.
-Convert to use st_mtim instead of st_mtimespec.
-Fix various cases with 3 or 4 parameters in test(1) to be POSIX
compliant.
-Use intmax_t as a quad replacement instead of long long.
-__printflike() should really be __printf0like().
-Localize (LC_CTYPE).
-Cleanup whitespace.
-Simplify markup in man page.
-Describe how test(1) will evaluate its expressions for a symlink.
-Document that both sides of -a or -o are always evaluated.

Obtained-from: FreeBSD