For https://issues.apache.org/bugzilla/show_bug.cgi?id=56990
Configure Eclipse to use Java 6 compliance settings for tomcat-7.0.x project instead of workspace-wide defaults

The issue was noted via documentation comment on building.html page.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1627236 13f79535-47bb-0310-9956-ffa450edef68