gnatvsn.ads (Gnat_Static_Version_String): New constant, used to minimize the differences with ACT tree.

	* gnatvsn.ads (Gnat_Static_Version_String): New constant, used to
	minimize the differences with ACT tree.

	* gnatkr.adb, gnatlink.adb, gnatls.adb, gnatmake.adb,
	gnatprep.adb, gnatpsta.adb, gnatvsn.ads: Take advantage of
	Gnatvsn.Gnat_Static_Version_String to reduce differences between
	ACT and FSF trees.

From-SVN: r72896