Remove trailing semicolons from DEFINE_ENUM_FLAG_OPERATORS statements (#122)

Applications which use the DirectX header files in the Windows SDK typically use the /winsysroot command line argument. Winsysroot conveniently ignores warnings in header files.

Applications that wish to take an additional dependency on https://github.com/microsoft/directx-headers cannot leverage /winsysroot because you can only have one /winsysroot.

This change makes DirectX header files compile warning free with CLang by removing semicolons from DEFINE_ENUM_FLAG_OPERATORS statements.

Co-authored-by: Rafael Cintron <rcintron@microsoft.com>

Author: RafaelCintron