[swift2objc] Built in declarations should only come from the built in module

[liamappelbe]

Restrict tryParseBuiltInDeclaration to symbols that come from the built in Foundation module. There are symbols in other modules that have IDs starting with c:objc(cs), so if we treat them all as built in, then users can't actually generate bindings for them.

[github-actions]

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[coveralls]

coverage: 77.403% (+0.001%) from 77.402%
when pulling 7ee22f7 on swift2objc_builtin
into 99456de on main.