sbin/vinum doesn't compile when -DVINUMDEBUG

[Antonio Huete Jimenez]

Hi all,

Seems that sbin/vinum doesn't compile when you specify -DVINUMDEBUG in 
the Makefile.
You need to compile vinum utility with -DVINUMDEBUG just in case you 
have "options VINUMDEBUG" specified in your kernel config file.

I have changed:
- BUF_CMD_READ instead B_READ
- struct rqinfo bp member for bio member.
- b_blkno for bio.bio_offset
http://leaf.dragonflybsd.org/~tuxillo/patches/list.c.diff

Regards,
Antonio Huete