pidgin/pidgin

Add underscore in Meson sources lists.

2020-12-29, Elliott Sales de Andrade
16127907763b
Add underscore in Meson sources lists.

Except for zephyr, which will be done in /r/302.

Testing Done:
Compile only.

Reviewed at https://reviews.imfreedom.org/r/312/
pidgin3_xml = configure_file(
input : 'pidgin3.xml.in',
output : 'pidgin3.xml',
configuration : version_conf,
install : true,
install_dir : get_option('datadir') / 'glade/catalogs')