pidgin/pidgin

Update COPYRIGHT file

2022-05-10, Richard Laager
ff07001f177b
Update COPYRIGHT file

I audited the Copyright lines in Pidgin 2. This brings the COPYRIGHT
file in line.

Reviewed at https://reviews.imfreedom.org/r/1424/
syntax: glob
.*.swp
.DS_Store
.flatpak-builder
*.pyc
*~
\#*\#
syntax: regexp
^build(.+)?\/
win32-install-dir(\.release)?
po\/pidgin\.pot$
^subprojects\/.+\/