pidgin/pidgin

Remove the oscar protocol plugin from po/POTFILES.in
release-2.x.y v2.14.3
2021-04-08, Gary Kramlich
723c284ecfa1
Remove the oscar protocol plugin from po/POTFILES.in

Testing Done:
Ran `make dist` successfully.

Reviewed at https://reviews.imfreedom.org/r/601/
[main]
host = https://www.transifex.com
[pidgin.pidgin_pot-for-2_x_y]
file_filter = po/<lang>.po
source_file = po/pidgin.pot
source_lang = en