pidgin/pidgin

Now that the History API is here, remove the purple logging api

Testing Done:
Sent ims in both pidgin3 and finch3, also joined a chat in pidgin3 and verified that the preferences window is okay.

Reviewed at https://reviews.imfreedom.org/r/1077/
subdir('reference')
if ENABLE_GTK
pidgin_man = configure_file(
input : 'pidgin3.1.in',
output : 'pidgin3.1',
configuration : man_conf,
install : true,
install_dir : get_option('mandir') / 'man1')
endif
if enable_consoleui
finch_man = configure_file(
input : 'finch3.1.in',
output : 'finch3.1',
configuration : man_conf,
install : true,
install_dir : get_option('mandir') / 'man1')
endif