[Bug fortran/49111] Unnecessary warning for private interfaces having the BIND(C) attribute

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49111
Bug 49111 depends on bug 64861, which changed state.

Bug 64861 Summary: Possible wrong code with BIND(C) and PRIVATE + slightly 
bogus warning
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64861

           What    |Removed                     |Added
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             Status|WAITING                     |RESOLVED
         Resolution|---                         |DUPLICATE