In the UNIX build, make some compiler warnings which we usually fix up fatal build errors. This should help with catching these warnings on the buildbots.
In the UNIX build, make some compiler warnings which we usually fix up
fatal build errors. This should help with catching these warnings on the
buildbots.

* configure.ac
  (CMAINTAINERFLAGS): Make -Wshadow, -Wunused, and -Wmissing-declarations
   fatal build errors.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1441110 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion