pidgin/pidgin

Remove pidgin_dialogs_info and gtkdialogs.[ch] as it is now empty.

We have a new API for this and the old dialog just wasn't to fit in there.

Testing Done:
Ran with the turtles and ran the app.

Reviewed at https://reviews.imfreedom.org/r/3109/
syntax: glob
.*.swp
.DS_Store
.flatpak-builder
*.pyc
*~
\#*\#
syntax: regexp
^build(.+)?\/
win32-install-dir(\.release)?
po\/pidgin3\.pot$
^subprojects\/.+\/