pidgin/pidgin

Add missing self-referential #include.

2020-11-20, Elliott Sales de Andrade
406ff566ad57
Add missing self-referential #include.

Fixes a function-without-prototype warning.

Testing Done:
Compile.

Reviewed at https://reviews.imfreedom.org/r/245/
REVIEWBOARD_URL = "https://reviews.imfreedom.org/"
REPOSITORY = "pidgin/pidgin"
REPOSITORY_TYPE = "mercurial"
BRANCH = "default"
LAND_DEST_BRANCH = "default"
LAND_PUSH = False