g10: Use es_fopen instead of open.
* g10/tofu.c: Don't include <utime.h>, <fcntl.h> or <unistd.h>. (busy_handler): Replace use of open with es_fopen.
Thanks for Werner for pointing this out: es_fopen is more portable
than open.
- Signed-off-by: Neal H. Walfield <neal@g10code.com>