Revert "Remove support for MSVC"

sky/engine/platform/Length.h

 /*
     Copyright (C) 1999 Lars Knoll (knoll@kde.org)
     Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
     Copyright (C) 2011 Rik Cabanier (cabanier@adobe.com)
     Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
@@ skipping 102 matching lines @@
     Length& operator=(const Length& length)
     {
         if (length.isCalculated())
             length.incrementCalculatedRef();
         if (isCalculated())
             decrementCalculatedRef();
         memcpy(this, &length, sizeof(Length));
         return *this;
     }
 
+#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
     Length(Length&& length)
     {
         memcpy(this, &length, sizeof(Length));
 
         // Reset |length|'s type to Auto to make sure its destructor
         // won't call decrementCalculatedRef() as we don't call
         // incrementCalculatedRef() here.
         length.m_type = Auto;
     }
 
     Length& operator=(Length&& length)
     {
         if (this == &length)
             return *this;
 
         if (isCalculated())
             decrementCalculatedRef();
 
         memcpy(this, &length, sizeof(Length));
 
         // Reset |length|'s type to Auto to make sure its destructor
         // won't call decrementCalculatedRef() as we don't call
         // incrementCalculatedRef() here.
         length.m_type = Auto;
 
         return *this;
     }
+#endif
 
     ~Length()
     {
         if (isCalculated())
             decrementCalculatedRef();
     }
 
     bool operator==(const Length& o) const { return (m_type == o.m_type) && (m_quirk == o.m_quirk) && (isMaxSizeNone() || (getFloatValue() == o.getFloatValue()) || isCalculatedEqual(o)); }
     bool operator!=(const Length& o) const { return !(*this == o); }
 
@@ skipping 184 matching lines @@
         float m_floatValue;
     };
     bool m_quirk;
     unsigned char m_type;
     bool m_isFloat;
 };
 
 } // namespace blink
 
 #endif // Length_h