pidgin/pidgin

Make our windows builds usable from meson.
release-2.x.y
2021-04-19, Gary Kramlich
2ff89178eb3d
Make our windows builds usable from meson.

This creates our pkg-config files on windows as well as fixes an include in
pidgin.h which can cause some issues.

This isn't usable as is, as you need a machine-file and a pkg-config wrapper
to make this all work, but that will be updated in the win32-dev.7z file thats
on data.imfreedom.org.

Testing Done:
Compiled guifications2 (which now uses meson) on windows and verified it works.

Reviewed at https://reviews.imfreedom.org/r/615/
man_MANS =
if ENABLE_GTK
man_MANS += pidgin.1
endif
if ENABLE_GNT
man_MANS += finch.1
endif
EXTRA_DIST = \
C-HOWTO.dox \
PERL-HOWTO.dox \
SIGNAL-HOWTO.dox \
TCL-HOWTO.dox \
TracFooter.html \
TracHeader.html \
account-signals.dox \
blist-signals.dox \
certificate-signals.dox \
cipher-signals.dox \
connection-signals.dox \
conversation-signals.dox \
core-signals.dox \
dbus-server-signals.dox \
funniest_home_convos.txt \
finch.1.in \
gtkaccount-signals.dox \
gtkblist-signals.dox \
gtkconv-signals.dox \
gtklog-signals.dox \
gtkimhtml-signals.dox \
gtkrc-2.0 \
imgstore-signals.dox \
jabber-signals.dox \
log-signals.dox \
notify-signals.dox \
pidgin.1.in \
plugin-i18n.dox \
plugin-ids.dox \
plugin-signals.dox \
savedstatus-signals.dox \
sound-signals.dox \
the_penguin.txt \
xfer-signals.dox