pidgin/pidgin

Make it possible so that libpurple plugins can use functions defined in libpurple/glibcompat.h

Testing Done:
Compiled on linux and raspberry pi os which fixes that build.

Reviewed at https://reviews.imfreedom.org/r/169/
pidgin3_xml = configure_file(
input : 'pidgin3.xml.in',
output : 'pidgin3.xml',
configuration : version_conf,
install : true,
install_dir : get_option('datadir') / 'glade/catalogs')