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/
syntax: glob
.*.swp
.DS_Store
.flatpak-builder
*.pyc
*~
\#*\#
subprojects/*/
syntax: regexp
^build(.+)?\/
win32-install-dir(\.release)?