C++ PATCH for c++/57532 (bogus error with int() & int())

[Jason Merrill]

In C++98 mode we were complaining about trying to apply a ref-qualifier 
to the function type int() during tentative parsing; the easiest fix is 
just not to try to tentatively parse ref-qualifiers in C++98 mode, which 
also lets us fail the tentative parse faster.

Tested x86_64-pc-linux-gnu, applying to trunk and 4.8.
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