C++ PATCH for c++/43509 (ICE on invalid scope with -std=c++0x)

[Jason Merrill]

In C++0x mode we were accepting any typedef name before :: in order to 
support scoped enumerator lookup.  But we only need to handle enums in 
this code, not any type at all.

Tested x86_64-pc-linux-gnu, applied to trunk.  Only touches C++0x code.
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