Modify copyright script to pull current year from `date`.

src/tools/copyright

 #!/bin/sh
 
-# $PostgreSQL: pgsql/src/tools/copyright,v 1.11 2006/03/11 04:38:41 momjian Exp $
+# $PostgreSQL: pgsql/src/tools/copyright,v 1.12 2007/01/05 21:09:53 momjian Exp $
 
 rgrep -l 'Copyright.*PostgreSQL Global Development Group' | while read FILE
 do
-	pipe sed 's/^\(.*Copyright (c) [12][0-9][0-9][0-9]-\)[12][0-9][0-9][0-9]\(, PostgreSQL Global Development Group.*\)$/\12006\2/' $FILE
+	pipe sed 's/^\(.*Copyright (c) [12][0-9][0-9][0-9]-\)[12][0-9][0-9][0-9]\(, PostgreSQL Global Development Group.*\)$/\1'`date '+%Y'`'\2/' $FILE
 done
 
 echo "Manually update doc/src/sgml/legal.sgml too" 1>&2