SystemTools: Fix Touch to avoid requiring file ownership
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SystemTools::Touch should only require +w file permissions. The previous
implementation used stat to get the current time, and then passed that
time to one of utimensat/utimes/utime. However, utimes/utimensat only
permit an arbitrary-time argument to be passed by the file owner.
Therefore, per the docs, we pass NULL for the times argument to utimes
and utimensat, to indicate using the current time. This is permitted for
any UID with +w on the file.
Fallback usage of utime is removed as unnecessary.
Issue: cmake/cmake#16526 (closed)
Topic-rename: SystemTools-simplify-touch