pidgin/pidgin

Clean up some unused stuff in PurpleConnection and PurpleProtocolServer

Testing Done:
Called in the turtles

Reviewed at https://reviews.imfreedom.org/r/3082/
if get_option('doc')
subdir('libpurple')
subdir('protocols')
if ENABLE_GTK
subdir('pidgin')
else
pidgin_doc = []
endif
alias_target('doc', libpurple_doc, protocols_doc, pidgin_doc)
endif