Filtered requiredby list for non-primary depends

For something like gambas3 which has a makedepend on postgresql, we end
up getting every single split package listed in the required by list for
postgresql. This is a bit crazy and unnecessary, so slim it down a bit
when possible by using a slightly crazy groupby function and some smarts
in our get_requiredby function.

Signed-off-by: Dan McGee <dan@archlinux.org>

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