Revert "Revert "Utils: Remove old compiler support code""

Thomas provided a smaller fix.
This reverts commit 78fb7f44bf.

Change-Id: I1edff6477526fe4ce29df38852f47fe49117561e
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/libs/utils/smallstringvector.h

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