pidgin/pidgin

Replace mentions of Freenode with Libera and move README.hg to HACKING which just directed to the website
release-2.x.y
2021-06-21, Gary Kramlich
c8d074d77a1e
Replace mentions of Freenode with Libera and move README.hg to HACKING which just directed to the website

Testing Done:
Compiled

Reviewed at https://reviews.imfreedom.org/r/768/
prefix=@prefix@
exec_prefix=@exec_prefix@
libdir=@libdir@
includedir=@includedir@
datarootdir=@datarootdir@
datadir=@datadir@
sysconfdir=@sysconfdir@
Name: Pidgin (Gaim compatibility)
Description: Pidgin is a GTK2-based instant messenger application.
Version: @VERSION@
Requires: glib-2.0
Cflags: -I${pc_top_builddir}/${pcfiledir}/libpurple -I${pc_top_builddir}/${pcfiledir}/pidgin
Libs: ${pc_top_builddir}/${pcfiledir}/libpurple/libpurple.la