library versioning: Don't bump major version

Eight libraries have unused yet valid symbol maps.  The original plan was
to activate them together and bump all the major library versions at the
same time.  This never happened because the libc symbol map isn't quite
right yet.  However, it's not necessary to bump the version.  If mapped,
both the versioned and unversioned symbol will be available and will
reference the same location, so no breakage will occur.

Once confirmed, the next commit will remove the "RELEASE36" check.  The
c library guard had changed to RELEASE42, so the intent is to activate
versioning on 7 of the 8 libraries in one step.
library versioning: Activate versioning on 7 libraries

All 4.2 packages currently on the system will continue to work on
a system after this commit.  However, the next bulk run of packages will
build using these symbol versions and will not work on systems older
than this commit.  Part of the joys of running on bleeding edge I think.
The next bulk run won't be for a couple of weeks at least (I'm waiting
on a disruptive and huge patch of perl and pgsql to settle down) so there
is no impending breakage expected.

The newly mapped libraries are: z, ncurses, lzma, edit, archive, md, bz2