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/smallstringview.h

@@ -31,16 +31,6 @@
 
 #include <cstring>
 
-#pragma push_macro("constexpr")
-#ifndef __cpp_constexpr
-#define constexpr
-#endif
-
-#pragma push_macro("noexcept")
-#ifndef __cpp_noexcept
-#define noexcept
-#endif
-
 namespace Utils {
 
 class SmallStringView
@@ -135,6 +125,3 @@ bool operator!=(const SmallStringView& first, const SmallStringView& second) noe
 }
 
 } // namespace Utils
-
-#pragma pop_macro("noexcept")
-#pragma pop_macro("constexpr")