debug.adb: Remove doc for gnatmake/gprbuild switch -ds.

debug.adb: Remove doc for gnatmake/gprbuild switch -ds.

2014-08-01  Vincent Celier  <celier@adacore.com>

	* debug.adb: Remove doc for gnatmake/gprbuild switch -ds.
	* make.adb (List_Bad_Compilations): Use Opt.No_Exit_Message
	instead of Debug.Debug_Flag_S.
	* makeutl.adb (Finish_Program, Fail_Program): Use Opt flag
	No_Exit_Message instead of Debug.Debug_Flag_S to suppress exit
	error messages.
	* makeutl.ads (No_Exit_Message_Option): New constant string
	for switch --no-exit-message.
	* opt.ads (No_Exit_Message): New Boolean flag, defaulted to False.
	* switch-m.adb (Scan_Make_Switches): Recognize new switch
	--no-exit-message.

From-SVN: r213424