*: 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/selinux/selinuxenabled.c b/selinux/selinuxenabled.c
index 1cf93c3..aa4e63f 100644
--- a/selinux/selinuxenabled.c
+++ b/selinux/selinuxenabled.c
@@ -4,7 +4,7 @@
  * Based on libselinux 1.33.1
  * Port to BusyBox  Hiroshi Shinji <shiroshi@my.email.ne.jp>
  *
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
  */
 #include "libbb.h"