[Patch, Fortran, comitted] PR56969 - Fix bogus ambiguous symbol error for ISO_C_Binding intrinsics

[Tobias Burnus]

The problem was that C_ASSOCIATED was made available multiple times. As 
gfc_intrinsic_func_interface calls gfc_intrinsic_symbol, the sym->module 
was set to "(intrinsic)" which didn't match the original 
"__iso_c_binding". Hence, the symbols weren't recognized as the same and 
an error is printed.

I have commit the attached patch as obvious, after a successful built 
and regtesting on x86-64-gnu-linux.
Rev. 198000.

Tobias
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