ada: Remove -gnatdJ switch

ada: Remove -gnatdJ switch

Using -gnatdJ with various other switches was error prone.
Remove this switch since the primary users of this mode
GNATCheck and Codepeer no longer need it.

gcc/ada/

	* debug.adb: Remove mentions of -gnatdJ.
	* errout.adb: Remove printing subprogram names to JSON.
	* erroutc.adb: Remove printing subprogram names in messages.
	* erroutc.ads: Remove Node and Subprogram_Name_Ptr used for -gnatdJ.
	* errutil.adb: Remove Node used for -gnatdJ
	* gnat1drv.adb: Remove references of -gnatdJ and
	Include_Subprgram_In_Messages.
	* opt.ads: Remove Include_Subprgram_In_Messages
	* par-util.adb: Remove behavior related to
	Include_Subprgram_In_Messages.
	* sem_util.adb: Remove Subprogram_Name used for -gnatdJ