[7u4-osx] Request for approval for 7123107: [macosx] native ccache

[Weijun Wang]

Hello

This a request to push the following changes to jdk7u-osx.

7123107: [macosx] native ccache to jdk7u-osx

CR: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7123107
Webrev: http://cr.openjdk.java.net/~weijun/7123107/webrev.01/

The major part of the fix is contributed by Apple through Mike Swingler. 
Minor changes added and the final webrev has been reviewed on 
macosx-port-dev mailing list by Scott Kovatch and me.

Thanks
Max