s-osinte-mingw.ads: Add support for Ada.Execution_Time on Windows.

s-osinte-mingw.ads: Add support for Ada.Execution_Time on Windows.

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.

From-SVN: r127434