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Handle MOVED_LIBS in `make *-old-files`
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Authored by emaste on Oct 13 2023, 6:21 PM.
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Summary
MOVED_LIBS is used when a library moves from one directory to another,
e.g. /usr/lib/libc++.so.1 to /lib/libc++.so.1.  Having two copies of
the same shared library (with the same so version) can cause trouble,
as shown in the referenced PR.

delete-old-files and delete-old-libs are two separate steps, so that
old libraries can be retained until third party software packages are
rebuilt or reinstalled.  Libraries listed in MOVED_LIBS are logically
equivalent to updating a library without changing the so version, and
should be removed as soon as possible, so handle them in *-old-files.

Leave them in *-old-libs for now, in case the user updates their tree
between running delete-old-files and delete-old-libs.

PR:             272642

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rG FreeBSD src repository
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