Remove obsolete reference to ddk; Fixes for -Werror

Bug: 14416410

1. The new mingw-w64 toolchain x86_64-w64-mingw32-4.8 has ddk
   in x86_64-w64-mingw32/include/ddk
2. Add -Wno-error=cpp to suppress a warning that turns into error
   thanks to -Werror:

      Please include winsock2.h before windows.h
3. Cast GetLastError() return type DWORD to "int"
4. Include direct.h for _mkdir
5. Include stdint.h for uint8_t on Windows

Change-Id: I4bec0587f6573692f08c760da6c98ae551b8b5eb