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[Ada] Make sure the Clock is thread safe


Use a simple lock when updating the base values (ticks, time, clock).

Tested on x86_64-pc-linux-gnu, committed on trunk

2013-02-06  Pascal Obry  <obry@adacore.com>

	* s-osprim-mingw.adb (Clock): Make sure we copy all data locally
	to avoid interleaved modifications that could happen from another
	task calling Get_Base_Data.
	(Get_Base_Data): Make it a critical section. Avoid updating if another
	task has already done it.

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