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[Ada] support for Ada.Execution_Time on windows

Manually tested on i686-mingw
Tested on i686-linux, committed on trunk

Add support for Ada.Execution_Time on Windows.

Also add support for the pragma Task_Info on Windows.
The Task_Info pragma can be used to give OS dependant information
about the handling of specific tasks. In this case we add support
for telling the Windows scheduler to run a task on a specific CPU.

2007-08-14  Pascal Obry  <obry@adacore.com>

	* s-osinte-mingw.ads: Add support for Ada.Execution_Time on Windows.
	(SYSTEM_INFO): New record.
	(SetThreadIdealProcessor): New imported routine needed for supporting
	task_info pragma on Windows.

	* s-taprop-mingw.adb (Enter_Task): Check if CPU number given in task
	info can be applied to the current host.
	(Create_Task): Set the ideal processor if information is present.

	* s-tasinf-mingw.adb, s-tasinf-mingw.ads,
	a-exetim-mingw.adb, a-exetim-mingw.ads: New files.

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