pidgin/pidgin

Not sure how `make release` worked in the past but this should fix it for now.
release-2.x.y v2.14.1
2020-06-11, Gary Kramlich
f902de8a1b5e
Not sure how `make release` worked in the past but this should fix it for now.
installed_m4=purple.m4
EXTRA_DIST=$(installed_m4)
m4datadir=$(datadir)/aclocal
m4data_DATA=$(installed_m4)