UPDATING: Note compat objdirs too.

UPDATING: I accidentally a word in previous.

UPDATING: Note xz (liblzma) needs clean too for -fvisibility=hidden.

UPDATING: Note that libmagic requires clean too.

UPDATING: Really only need make clean, not cleandir, for libarchive.

*.d and .depend files are still fine, just the .so that needs to be
relinked.

UPDATING: Just need to clean libarchive/lib, not libarchive/bin too.

UPDATING: Note libarchive requires clean.

UPDATING: Note stale .actsym files and suggest workaround.

UPDATING: Expand list of deletions for zstd mess.

1. Don't use $ for variables -- if you copy & paste, e.g.,

rm -rf $DESTDIR/usr/lib/libarchive*

and DESTDIR is not actually defined in the envi

UPDATING: Expand list of deletions for zstd mess.

1. Don't use $ for variables -- if you copy & paste, e.g.,

rm -rf $DESTDIR/usr/lib/libarchive*

and DESTDIR is not actually defined in the environment, you might
be an unhappy camper. (Resolvable by using /bin/pax to extract
the library from base.tgz but not great!)

2. Nix compat libraries and libmagic too.

3. Sort for easier maintenance.

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one more update for zstd

Extend the zstd entry: need to clean DESTDIR

zstd changes break update builds, document workaround

Revert previous - the build is broken, unrelated to update builds.

OpenSSL changes require a full rebuild

UPDATING: note problem with malloc_np.h

Ammend the libc/jemalloc entry with hints for architectures with
compat libraries.

Note update build issues with jemalloc vs. jemalloc.old

mention awk directory issue

UPDATING: Nix trailing whitespace.

Note gdb switch may require removing tool gdb build dirs.

Fix date for binutils vs. binutils.old entry

Note update build lossage for binutils vs. binutils.old

Note need to deal with old libarchive.so files in cdrom images when doing
an update build.

UPDATING: fix an old typo

libm: New s_rintl.S for x86.

Prompted by PR lib/58054.