Auto-generated dependencies for builds against rawhide glibc snapshots

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I've pushed a new glibc build to rawhide (glibc-2.33.9000-29.fc35) that
auto-generates versioned dependencies on glibc if symbols within the
under-development symbol version are used, where the ELF-derived RPM
dependencies are inaccurate.  Given the change to the startup code, this
affects all programs in this release cycle, and the libdl and libpthread
changes mean that most shared objects trigger the versioned dependency
as well.

The dependencies are conservative in the sense that you might a
dependency on a more recent glibc version than that is actually
required by the symbols used.

For the technical background, here's what I put into a comment within
the dependency generator itself:

# A glibc development snapshot (say version 2.33.9000) may define
# symbols in its under-development symbol version (GLIBC_2.34).  RPM
# automatically derives RPM dependencies such as
# libc.so.6(GLIBC_2.34)(64bit) from that.  While the GLIBC_2.34
# version is under development, these dependencies may be inaccurate
# and could be satisfied by glibc RPM package versions that lack the
# symbols because they were created from an earlier development
# snapshot that had some other GLIBC_2.34 symbols.  Therefore, if the
# latest, under-development ELF symbol version is detected, this
# dependency generator adds an explicit RPM dependencies on the glibc
# packaging version against which an RPM package is built.

I've tested this to the best of my abilities, and it seems to work as
expected, but given that this new territory for me, there could be some
issues (like the race condition in the dependency generator discussed in
that other thread).

Thanks,
Florian
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