Address compilation warnings in libawt with VS2017

There are a number of warnings (treated as errors) when building libawt with VS2017. These should be investigated and addressed. Examples include:

src/java.desktop/windows/native/libawt/java2d/d3d/D3DPipelineManager.cpp(959): error C2220: warning treated as error - no 'object' file generated
src/java.desktop/windows/native/libawt/java2d/d3d/D3DPipelineManager.cpp(959): warning C4291: 'void *operator new[](::size_t,const char *,int)': no matching operator delete found; memory will not be freed if initialization throws an exception
src/java.desktop/windows/native/libawt/windows/awt_Toolkit.cpp(3144): warning C4311: 'type cast': pointer truncation from 'HINSTANCE' to 'int'
src/java.desktop/windows/native/libawt/windows/awt_Toolkit.cpp(3144): warning C4302: 'type cast': truncation from 'HINSTANCE' to 'int'