Makefile: delete output on error

I had a disk full condition and a partial hex file
got generated. Following make failed trying to use it.
We can make build a bit more robust by instructing
make to remove output files on error.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
1 file changed
tree: 6a17d037772455cdbddd777adb56b12fc94f1008
  1. .gitignore
  2. COPYING
  3. COPYING.LESSER
  4. Makefile
  5. README
  6. TODO
  7. src/
  8. tools/
  9. vgasrc/