2006-10-31  Vincent Celier  <celier@adacore.com>

	* g-os_lib.ads, g-os_lib.adb (Locate_Exec_On_Path): Always return an
	absolute path name.
	(Locate_Regular_File): Ditto
	(Change_Dir): Remove, no longer used
	(Normalize_Pathname): Do not use Change_Dir to get the drive letter
	on Windows. Get it calling Get_Current_Dir.
	(OpenVMS): Remove imported boolean, no longer needed.
	(Normalize_Pathname)[VMS]: Do not resolve directory names.
	(Pid_To_Integer): New function to convert a Process_Id to  Integer

From-SVN: r118279