The first patch closes at least one of the "dangling .so references"
bugs I reported recently; it should close all those where the dangling
references are to libtalloc, libtevent, libtdb, libwbclient, and
libcrypt.  Possibly more, because those libs are just the ones that bit
me while building mplayer2, whereas the lib/ directory of samba had many
more .so files with dangling references (which apparently "infect" any
executables which in turn link to those .so files, if I'm not mistaken).

I could "manually" try to find out which of the bug reports are closed
by this, but I guess the smartest approach is to push the patch, wait
for the build farm to rebuild all samba-depending packages, do a "guix
package -u", "guix package -d <something>" and "guix gc" to prune the
old versions from the store, then reuse my method to find all the
dangling .so references in my store and see which ones disappeared.