For maintainers, add a bunch of flags to the GCC compilation line to flag more warnings about our constructs.
For maintainers, add a bunch of flags to the GCC compilation line to flag
more warnings about our constructs.

* configure.ac:
  (CFLAGS): add flags when --enable-maintainer-mode is specified


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@874332 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion