Fix for _HAS_CXX17 == 0

Copied from solution to https://github.com/nlohmann/json/issues/464

Fix for _HAS_CXX17 == 0
59cde1ad · Jamie Seward · 1a666799 · 59cde1ad
Commit 59cde1ad authored Oct 21, 2017 by Jamie Seward
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json.hpp src/json.hpp +1 -1

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--- a/src/json.hpp
+++ b/src/json.hpp
@@ -110,7 +110,7 @@ SOFTWARE.
 #endif

 // string_view support
-#if defined(_MSC_VER) && defined(_HAS_CXX17)
+#if defined(_MSC_VER) && defined(_HAS_CXX17) && _HAS_CXX17 == 1
 	#define JSON_USE_STRING_VIEW
 #endif