Revert "Utils: Remove old compiler support code"

This reverts commit 8a32bcc5e7.

Broke build with MSVC 2015, update 3

Change-Id: Icb59b70fb00ea2a2ecc8d26c8177d21d82aaccf2
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/libs/utils/smallstringvector.h

@@ -33,6 +33,11 @@
 
 #include <QStringList>
 
+#pragma push_macro("noexcept")
+#ifndef __cpp_noexcept
+#define noexcept
+#endif
+
 namespace Utils {
 
 template<uint SmallStringSize>
@@ -155,3 +160,5 @@ private:
 using SmallStringVector = BasicSmallStringVector<31>;
 using PathStringVector = BasicSmallStringVector<191>;
 } // namespace Utils;
+
+#pragma pop_macro("noexcept")