remove .gitattributes
remove .gitattributes

None of these file patterns match any existing files.

Change-Id: I069bab91fe43887b094d02e6328b00da62706d94

webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx