Utils: Remove old compiler support code

We now support constexpr, noexcept and alignas on all compilers. Next will
be C++ 14 constexpr support.

Change-Id: I254049c60dcd82fc373ec907cbb5702a4b344978
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/libs/utils/smallstringiterator.h

@@ -28,11 +28,6 @@
 #include <cstddef>
 #include <iterator>
 
-#pragma push_macro("noexcept")
-#ifndef __cpp_noexcept
-#define noexcept
-#endif
-
 namespace Utils {
 
 namespace Internal {
@@ -151,5 +146,3 @@ private:
 } // namespace Internal
 
 } // namespace Utils
-
-#pragma pop_macro("noexcept")