[PATCH] [RFC] PR20146 - Cannot return void with qualifiers

[Zach Davis]

As reported in bug 20146, a function cannot have a return type of
'void' with qualifiers.

Clang does emit a warning that the qualifiers are ignored
[-Wignored-qualifiers] (off by default), but according to [1] this
code is non-conforming.

The attached patch makes Clang issue a more specific warning like so:

    test3.c:8:18: warning: return type of void cannot be qualified
'volatile void'
    volatile void baz(void) { return; }
                  ^

[1] http://www.open-std.org/jtc1/sc22/wg14/docs/rr/dr_113.html
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