BUILDLINK_API_DEPENDS for libpurple and pidgin

["Jeremy C. Reed" <reed%reedmedia.net@localhost>]

I have installed: pidgin-2.3.1 and libpurple-2.3.1.

I went to install chat/pidgin-otr, but it tried to bring in new versions 
of pidgin and libpurple. So I stopped it and set 
BUILDLINK_API_DEPENDS.libpurple and BUILDLINK_API_DEPENDS.pidgin so 2.3.1 
version would be okay.

It built and installed fine. And as far as I can tell, it works fine. And 
I didn't have to restart pidgin -- just enabled plugin.

Is the API jump really required? Is the ABI jump really required? 
(ABI_DEPENDS tracks API_DEPENDS when not set.) For me it appears neither 
were needed.

Also, the PKGREVISION on chat/pidgin-otr was never increased related to 
the ABI changes of its dependencies, so I am guessing this was missed. But 
since as far as I know it is not needed, that is good.

Okay to lower the BUILDLINK_API_DEPENDS.libpurple and 
BUILDLINK_API_DEPENDS.pidgin so 2.3.1 version would be okay?