[RFC] calm, setup: per-version requires

[Achim Gratz]

With the possibility of having more than three versions in setup.ini and
per-version hint files, the need for per-version requires is getting
more urgent.  Currently the requires from the corresponding hint files
get merged, which leads to abominations like these (from mosh):

requires: … libprotobuf13 libprotobuf14 libprotobuf8 …

I suggest that the current requires: line is kept to contain the
intersection of all hint files and an additional requires: line in each
version group lists the relative complement of the corresponding hint
file and the non-versioned requires: line.  It may be necessary to
rename the requires: token to something else in order to ease parsing,
maybe something like requires+: to show that these are in addition to
the usual requires: line?


Regards,
Achim.
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