PATCH for c++/30112 (#pragma redefine_extname and extern "C" in std)

[Jason Merrill]

Apparently the Solaris C library headers play games with #pragma 
redefine_extname such that we need the pragma to affect extern "C" 
declarations in namespaces such as std, not just declarations at file scope.

To implement this, I added another C-family hook "c_linkage_bindings" 
that returns a list of C-linkage decls with the name in question.  In 
C/ObjC this just returns identifier_global_value, but it is more 
involved in C++.

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