gnatcmd.adb (GNATCmd): Do not issue -d= switch to gnatmetric when object directory of main project...

2007-12-06  Vincent Celier  <celier@adacore.com>

	* gnatcmd.adb (GNATCmd): Do not issue -d= switch to gnatmetric when
	object directory of main project does not exist.
	On VMS, correctly set then environment variable for the source
	directories.

From-SVN: r130841