pidgin/pidgin

Now that gplugin is no longer using hg flow we should be pointed at its default branch.

Testing Done:
Ran the subproject build convey plan.

Reviewed at https://reviews.imfreedom.org/r/104/
syntax: glob
.*.swp
.DS_Store
.flatpak-builder
*.pyc
*~
\#*\#
subprojects/*/
syntax: regexp
^build(.+)?\/
win32-install-dir(\.release)?