The ISO_C_BINDING procedures have been emitted directly by the front-end since 2012 (see for example https://gcc.gnu.org/ml/fortran/2012-06/msg00152.html and https://gcc.gnu.org/bugzilla/show_bug.cgi?id=32600). Having now broken the library ABI, we can remove them from the library, where they were kept only for compatibility.
Bootstrapped and regtested on x86_64-apple-darwin16.3.0 OK to commit? FX
iso_c_binding.ChangeLog
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iso_c_binding.diff
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