[PATCH] Add a warning implementing C89 3.5.7p3

[Enea Zaffanella]

Please find attached a patch (with testcase) implementing part of C89 
3.5.7 p3. C89 is stricter than C99, as it requires constant initializer 
list elements for aggregate/union type objects even when the objects do 
not have static storage duration.

OK to commit?

Enea.
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