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/
[wrap-hg]
directory = talkatu
url = https://keep.imfreedom.org/talkatu/talkatu
revision = default