pidgin/pidgin

Fixes from pull request #522 review
audiomixer-rate
2019-07-20, Fabrice Bellet
23b34e926db7
Fixes from pull request #522 review
installed_m4=purple.m4
EXTRA_DIST=$(installed_m4)
m4datadir=$(datadir)/aclocal
m4data_DATA=$(installed_m4)