sort: Only build FreeBSD-specific ALTMON_x stuff when ATLMON_1 is defined

On MacOS, we bootstrap sort. Since ALTMON_* are not defined there, the
build blows up. Since we don't need this feature for

sort: Only build FreeBSD-specific ALTMON_x stuff when ATLMON_1 is defined

On MacOS, we bootstrap sort. Since ALTMON_* are not defined there, the
build blows up. Since we don't need this feature for the FreeBSD build
process, and since we won't use it unless we actually install the NL
files that have this data in it, just #ifdef it out for now. In the
extremely unlikely event that the FreeBSD bootstrap/build process grows
this dependency, we can evaluate the best solution then (which most
likely is going to be not depend on the local's month names).

Fixes: 3d44dce90a69 (MacOS builds and github CI)
Sponsored by: Netflix
Reviewed by: jrtc27, [email protected], markj
Differential Revision: https://reviews.freebsd.org/D42868

(cherry picked from commit bd234c0d4c8256db7e5a1fdda9ef311c9e0080e4)

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sort: test against all month formats in month-sort

The CLDR specification [1] defines three possible month formats:

- Abbreviation (e.g Jan, Ιαν)
- Full (e.g January, Ιανουαρίου)
- Standalone (e.g

sort: test against all month formats in month-sort

The CLDR specification [1] defines three possible month formats:

- Abbreviation (e.g Jan, Ιαν)
- Full (e.g January, Ιανουαρίου)
- Standalone (e.g January, Ιανουάριος)

Many languages use different case endings depending on whether the month
is referenced as a standalone word (nominative case), or in date context
(genitive, partitive, etc.). sort(1)'s -M option currently sorts months
by testing input against only the abbrevation format, which is
essentially a substring of the full format. While this works fine for
languages like English, where there are no cases, for languages where
there is a different case ending between the abbreviation/full and
standalone formats, it is not sufficient.

For example, in Greek, "May" can take the following forms:

Abbreviation: Μαΐ (genitive case)
Full: Μαΐου (genitive case)
Standalone: Μάιος (nominative case)

If we use the standalone format in Greek, sort(1) will not able to match
"Μαΐ" to "Μάιος" and the sort will fail.

This change makes sort(1) test against all three formats. It also works
when the input contains mixed formats.

[1] https://cldr.unicode.org/translation/date-time/date-time-patterns

Reviewed by: markj
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D42847

(cherry picked from commit 3d44dce90a6946e2ef2ab30ffbf8e2930acf888b)

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