[PATCH] Have `__have_extension(cxx_variadic_templates)` return true for any C++ standard.

[Richard Smith]

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Comment at: lib/Lex/PPMacroExpansion.cpp:1239
@@ -1238,2 +1238,3 @@
            .Case("cxx_reference_qualified_functions", LangOpts.CPlusPlus)
+           .Case("cxx_variadic_templates", LangOpts.CPlusPlus)
            .Case("cxx_rvalue_references", LangOpts.CPlusPlus)
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http://reviews.llvm.org/D9423

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