Log Message:
mktool: Update to 1.2.0.

## Version 1.2.0 (2024-09-20)

 * check-shlibs: Add new "mktool check-shlibs" command.  Should behave the
   same as the awk implementations, but with additional features, and much
   faster runtime (0.6s vs 20.4s for x11/kde-workspace4).

 * fetch: Avoid unnecessary re-fetching when running 'make makedistinfo'.

 * Minor cleanups to checksum, distinfo, and fetch.