support 'provide one of the following' systemmodules
@cskeogh
Submitted by Craig Scott Keogh Link to original bug (#685147)
Description
As reported here [1], python-devel systemodule should be able to be met by python.pc or python-2.7.pc or python3.pc etc.
Extend systemmodule to support 'provide one (or more) of the following'.
[1] https://mail.gnome.org/archives/desktop-devel-list/2012-September/msg00080.html