[libobjc] May I tweak objc-api.h?

[Paul Schlie]

Or tweak the parser; because if "class" were also used as an identifier,
it should/would never be contextually ambiguous with it's use as a keyword.

Likely true for most keywords, as I don't believe there are any syntactic
contexts which expect an expression/value or a declaration/statement?

(although likely an issue that most would like to avoid wrestling with)