pidgin/pidgin

Add PURPLE_VERSION and PURPLE_EXTRA_VERSION to libpurple/version.h and clean up some other related stuff
gestures_SOURCES = [
'gestures.c',
'gstroke.h',
'gstroke-internal.h',
'stroke.c',
'stroke-draw.c'
]
if PLUGINS
gestures = library('gestures', gestures_SOURCES,
build_by_default: false,
dependencies : [x11, libpurple_dep, libpidgin_dep, glib],
name_prefix : '',
install : false, install_dir : PIDGIN_PLUGINDIR)
endif