Log Message:
x11/gtkmm3: restore ABI_DEPENDS as API_DEPENDS

wiz says: Packages are not supposed to set BUILDLINK_ABI_DEPENDS for
other packages, they should set BUILDLINK_API_DEPENDS (P instead of B).

After that change, all these entries actually have an effect since they
are greater than their corresponding default BUILDLINK_API_DEPENDS, and
pkglint no longer complains.