C++ PATCH for c++/46336 (ICE after complaint about extern "C" clash)

[Jason Merrill]

Here after we complained about the extern "C" we continued to try and 
merge the two definitions even though for a simple redefinition we give 
up.  In this case it seems to make most sense to treat the two functions 
as different since they have different signatures; they just clash 
because both are extern "C".

Tested x86_64-pc-linux-gnu, applying to trunk.
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