pidgin/pidgin

Update buddy.c to more closely match our current gobject structure.

Testing Done:
Compiled and ran pidgin locally.

Reviewed at https://reviews.imfreedom.org/r/473/
libpurple/data/purple-url-handler.desktop.in
libpurple/protocols/null/nullprpl.c
pidgin/data/im.pidgin.Pidgin.desktop.in
sub/libpurple/data/purple-url-handler.desktop.in
sub/libpurple/protocols/null/nullprpl.c
sub/pidgin/data/im.pidgin.Pidgin.desktop.in