pidgin/pidgin

Remove a lookup table that is no longer used
release-2.x.y
2021-02-11, Gary Kramlich
116464ec6245
Remove a lookup table that is no longer used

Testing Done:
Compiled.

Reviewed at https://reviews.imfreedom.org/r/496/
installed_m4=purple.m4
EXTRA_DIST=$(installed_m4)
m4datadir=$(datadir)/aclocal
m4data_DATA=$(installed_m4)