pidgin/pidgin

Add gi-docgen as a subproject so we can convert the documentation to it

Testing Done:
Just compiled and verified that our `.wrap` file didn't get overwritten by a `wrap-file` from gplugin.

Reviewed at https://reviews.imfreedom.org/r/1055/
IRC_SOURCES = [
'cmds.c',
'dcc_send.c',
'irc.c',
'irc.h',
'msgs.c',
'parse.c'
]
if DYNAMIC_IRC
irc_resources = gnome.compile_resources('ircresource',
'resources/irc.gresource.xml',
source_dir : 'resources',
c_name : 'irc')
IRC_SOURCES += irc_resources
irc_prpl = shared_library('irc', IRC_SOURCES,
dependencies : [sasl, libpurple_dep, glib, gio, ws2_32],
install : true, install_dir : PURPLE_PLUGINDIR)
devenv.append('PURPLE_PLUGIN_PATH', meson.current_build_dir())
endif