pidgin/pidgin

bump the minimum meson to 0.56.0 and fix the deprecations

2021-07-27, Gary Kramlich
9e5a5eb54a57
bump the minimum meson to 0.56.0 and fix the deprecations

Testing Done:
Verfied meson didn't complain about any deprecations.

Reviewed at https://reviews.imfreedom.org/r/843/
syntax: glob
.*.swp
.DS_Store
.flatpak-builder
*.pyc
*~
\#*\#
subprojects/*/
syntax: regexp
^build(.+)?\/
win32-install-dir(\.release)?
po\/pidgin\.pot$