pidgin/purple-plugin-pack

Remove now-unnecessary stuff from top-level meson.build.
meson
2017-06-23, Elliott Sales de Andrade
f80fd48d190a
Remove now-unnecessary stuff from top-level meson.build.
if PURPLE.found()
xmppprio = shared_library('xmppprio',
'xmppprio.c',
dependencies : [PURPLE, GLIB],
name_prefix : '',
install : true,
install_dir : PURPLE_LIBDIR)
PP_PURPLE_BUILD += 'xmppprio'
endif