[Ada] improve multi-task mode support under vxworks

[Arnaud Charlet <charlet at adacore dot com>]

Tested on i686-linux, committed on trunk

Polish the implementation of the VxWorks multi-task mode by adding
a stop function which can be called outside a breakpoint handler. This
is meant to be used when the debugger attaches an Ada application,
or when it interrupts it asynchronously. Rename the old implementation
of the stop function; this one should only be called from breakpoint
interrupt handlers.

2007-09-26  Jerome Guitton  <guitton@adacore.com>

	* s-taprop-lynxos.adb, s-taprop-tru64.adb, s-taprop-irix.adb,
	s-taprop-hpux-dce.adb, s-taprop-linux.adb, s-taprop-dummy.adb,
	 s-taprop-solaris.adb, s-taprop-vms.adb, s-taprop-mingw.adb,
	s-taprop-posix.adb (Stop_Task): New function, dummy implementation.

	* s-taprop.ads, s-taprop-vxworks.adb (Stop_Task): New function.

	* s-tasdeb.adb (Stop_All_Tasks): New function, implementing a run-time
	function which can be called by the debugger to interrupt the tasks of
	an Ada application asynchronously, as needed on VxWorks.
	(Stop_All_Tasks_Handler): Renamed from Stop_All_Tasks.

	* s-tasdeb.ads (Stop_All_Tasks_Handler): New function declaration,
	renamed from Stop_All_Tasks. Update comments.
	(Stop_All_tasks): New function declaration.

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