OF-741 Update pre-reqs for debian installer for Java7

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@13939 b35dd754-fafc-0310-a699-88a17e54d16e

build/debian/control

@@ -9,7 +9,7 @@ Homepage: http://www.igniterealtime.org
 Package: openfire
 Section: net
 Priority: optional
-Pre-Depends: sun-java5-jre | sun-java6-jre | default-jre-headless | openjdk-6-jre
+Pre-Depends: sun-java6-jre | default-jre-headless | openjdk-6-jre | openjdk-7-jre | oracle-java7-jre
 Architecture: all
 Description: A high performance XMPP (Jabber) server.
  Openfire is an instant messaging server that implements the XMPP