update Glenn McGrath's email address

diff --git a/archival/tar.c b/archival/tar.c
index 45fa4bd..11f5eba 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -3,7 +3,7 @@
  * Mini tar implementation for busybox
  *
  * Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg
- *  Glenn McGrath <bug1@iinet.net.au>
+ *  by Glenn McGrath
  *
  * Note, that as of BusyBox-0.43, tar has been completely rewritten from the
  * ground up.  It still has remnants of the old code lying about, but it is