pidgin/pidgin

Remove libsoup2 code

14 months ago, Elliott Sales de Andrade
8f7b46f497c6
Remove libsoup2 code

Soup 3 has been required since /r/2068.

Testing Done:
Compiled only.

Reviewed at https://reviews.imfreedom.org/r/2375/
libpurple/data/purple-url-handler.desktop.in
libpurple/protocols/null/nullprpl.c
pidgin/data/im.pidgin.Pidgin.desktop.in