Add missing copyright in the other file.
Add missing copyright in the other file.

sudosurootdev/external_libcxxrt,vegard/libcxxrt,xin3liang/platform_external_libcxxrt,xin3liang/platform_external_libcxxrt,cemeyer/libcxxrt,cemeyer/libcxxrt,cemeyer/libcxxrt,vegard/libcxxrt,xin3liang/platform_external_libcxxrt,sudosurootdev/external_libcxxrt,vegard/libcxxrt,sudosurootdev/external_libcxxrt