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w: Use POSIX <utmpx.h> functions where available

A. Wilcox requested to merge awilfox/procps:utmpx-support into master

<utmp.h> has been deprecated since 2001 in favour of <utmpx.h>.

On glibc systems, utmp is just an alias to utmpx, so there is no functional change using one over the other.

However, on the musl libc, a library (utmps) can be used to provide utmpx functionality - but not utmp. This means that procps either doesn't work properly (w shows nothing under musl with default no-op implementation), or fails to build (utmps provides utmpx.h but no utmp.h).

This commit will use utmpx.h where available, which allows w to work correctly with utmps and has no change on glibc systems.

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