pidgin/pidgin

Make gstreamer-1.0 a required dependency

2020-08-25, Gary Kramlich
9bcf96663cb9
Make gstreamer-1.0 a required dependency

Testing Done:
Compiled, ran, and sent an IM with a bonjour account with no options, `-Dvv=disabled`, `-Dvv=disabled -Dfarstream=disabled`, and with `-Dvv=disabled -Dfarstream=disabled -Dgstreamer-video=disabled`.

Reviewed at https://reviews.imfreedom.org/r/79/
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