- Unbreak the build against recent gdbm based on the patch provided by
the upstream maintainer*; this breakage went unnoticed for a while
because GDBM option was disabled by default -- enable it so we would
notice similar breakages next time (most of other ports by the same
upstream author/maintainer already default to it; this is very light
dependency yet useful enough as default database backend)
- Drop MAKE_JOBS_UNSAFE which had been added back in r269161 ten years
ago for version 4.1.1 and never properly explained; even though the
ChangeLog does not explicitly mention parallel build-related fixes,
the author confirmed that he does not recall any problems regarding
parallel builds; assume that it either was fixed in the meantime, or
would manifest itself again, only this time we'd catch the bug and,
at the very least, would properly document it (but ideally fix)
*) https://mail.gnu.org/archive/html/bug-anubis/2020-06/msg00004.html
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