more enabledby updates

[Manuel López-Ibáñez]

A few more straightforward uses. Bootstrapped and regression tested.

A strange thing is that -Wextra enables -Wtype-limits only in
C-family, however, it remains with value -1 in the rest of languages,
that is, enabled by default. I am surprised it does not trigger often
for Fortran and Ada.

OK?

2012-05-13  Manuel López-Ibáñez  <m...@gcc.gnu.org>

c-family/
        * c.opt (Wclobbered,Wempty-body,Wignored-qualifiers,
        Wmissing-field-initializers,Wmissing-parameter-type,
        Wold-style-declaration,Woverride-init): Use EnabledBy.
        * c-opts.c (c_common_post_options): Do not set here explicitly.
gcc/
        * common.opt (Wtype-limits): Use EnabledBy.

enabledby.diff
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