[PATCH] Allow TestVisitor-based tests to specify use of C++11

[James Dennett]

I have a patch to follow this to fix
RecursiveASTVisitor::TraverseLambdaExpr, but testing it requires use
of C++11 lambdas (strangely enough), so this (tiny) patch is a
precursor to enable that test.

I kept the default as C++98 for now, and I didn't add an explicit
Lang_C99 or Lang_CXX1Y (figuring that they can be added if/when
they're needed).

I'd like to get a sanity check before I commit this.  Any takers?

Thanks,

James
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