Log Message:
Update to 5.19-1.4.9.7, from FUKAUMI Naoki in PR 25433.
Make compile on statvfs systems.

Changes:
- growisofs 5.19-1 hotfix to address "flushing cache takes forever;
- 5.19.4.9.7 release;
- LG GSA-4081B fails to "SET STREAMING" with "LBA OUT OF \ 
RANGE" for
  DVD+RW media, but not e.g. DVD-R;
- dvd+rw-booktype: BTC support;
- make DVD-RAM work in "poor-man" mode;
- average write speed report at the end of recording;
- dvd+rw-format 4.9: permit for DVD-RW blank even if format descriptors
  are not present;
- Solaris: get rid of media reload, which made it possible to improve
  volume manager experience as well;
- address speed verification issues with NEC ND-2500 and Plextor
  PX-708A;
- IRIX: IRIX 6.x port is added;
- dvd+rw-tools-5.18.4.8.6: www.software.hp.com release;
- minimize amount of compiler warnings on 64-bit platforms;
- skip count-down if no_tty_check is set;
- -use-the-force-luke=tracksize:size option by suggestion from K3b;
- Linux: fix for "Bad file descriptor" with DVD+RW kernel patch;
- refuse to run if ${SUDO_COMMAND} is set;