Merge "Remove redundant module checks and references."

apps/app_confbridge.c

apps/app_meetme.c

apps/app_stack.c

apps/app_stasis.c

channels/chan_pjsip.c

funcs/func_curl.c

funcs/func_periodic_hook.c

include/asterisk/agi.h

include/asterisk/ari.h

include/asterisk/res_mwi_external.h

include/asterisk/res_pjproject.h

include/asterisk/res_pjsip.h

include/asterisk/res_pjsip_pubsub.h

include/asterisk/res_pjsip_session.h

include/asterisk/stasis_app.h

res/res_agi.c

res/res_ari.c

res/res_ari_applications.c

res/res_ari_asterisk.c

res/res_ari_bridges.c