Fix accessing files on networked drives on MS-Windows
* src/w32.c (acl_get_file): Set errno to ENOTSUP if get_file_security returns ERROR_NOT_SUPPORTED. (Bug#41463)
* src/w32.c (acl_get_file): Set errno to ENOTSUP if get_file_security returns ERROR_NOT_SUPPORTED. (Bug#41463)