Dear all,

when comparing formal and actual arguments of a procedure, there was no
check of rank for derived types from intrinsic module ISO_C_BINDING.
This could lead to a wrong resolution of generic procedures with dummy
argument of related types, see PR.  This was likely an oversight.

The attached fix is simple and regtests cleanly on x86_64-pc-linux-gnu.

OK for mainline?

Thanks,
Harald