*: make GNU licensing statement forms more regular

This change retains "or later" state! No licensing _changes_ here,
only form is adjusted (article, space between "GPL" and "v2" and so on).

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/testsuite/mount.testroot b/testsuite/mount.testroot
index e18d046..4f34c57 100755
--- a/testsuite/mount.testroot
+++ b/testsuite/mount.testroot
@@ -2,7 +2,7 @@
 
 # SUSv3 compliant mount and umount tests.
 # Copyright 2005 by Rob Landley <rob@landley.net>
-# Licensed under GPL v2, see file LICENSE for details.
+# Licensed under GPLv2, see file LICENSE in this source tree.
 
 if [ -z "$TESTDIR" ]
 then