pidgin/pidgin

Remove `purple_utf16*` functions.

2021-01-30, Elliott Sales de Andrade
265694d7b23d
Remove `purple_utf16*` functions.

Testing Done:
Compiled only.

Reviewed at https://reviews.imfreedom.org/r/468/
[main]
host = https://www.transifex.com
[pidgin.pidgin_pot-for-development-branch]
file_filter = po/<lang>.po
source_file = po/pidgin.pot
source_lang = en