pidgin/pidgin

Preparation for the 2.14.4 release
release-2.x.y v2.14.4
2021-04-29, Gary Kramlich
288a5b3e994f
Preparation for the 2.14.4 release

Testing Done:
Ran `make distcheck`

Reviewed at https://reviews.imfreedom.org/r/630/
installed_m4=purple.m4
EXTRA_DIST=$(installed_m4)
m4datadir=$(datadir)/aclocal
m4data_DATA=$(installed_m4)