Ruby 1.8. The multi-version logic was skipped for an attribute, if there
was only entry in the parameter list. This is wrong, if this entry is
not the default version for this attribute. Adjust.
Tested by comparing the resulting packages for a scan with and without
this change.
anyway, simplify logic a bit:
Add Python 2.5 to the default list, but also mark it as incompatible if
wip/python25 is not present. Move the Darwin handling after setting a
default value.
Provide a new variable _PYTHON_VERSIONS_ACCEPTED that is filtered by
PYTHON_VERSIONS_INCOMPATIBLE. This helps to avoid providing broken
dependencies when a version is not supported as PYPKGPREFIX wouldn't be
set in that case.
pbulk-index-item prints a number of variables used by the parallel bulk
build code during either the build, the report or the upload phase.
pbulk-index checks whether multiple versions of the current package
could be build (e.g. because multiple Python versions are supported) and
uses pbulk-index-item for each possible combination.
Thanks to David Laight for explaining the different between using :[#]
in the body of a make target and in a clause of an .if.
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