Let's back out LOADER_ZFS_SUPPORT from STABLE

[Dan Allen]

I have now proven that the recent post June 8th version of

	/usr/src/sys/boot/i386/loader/Makefile

causes catastrophic data loss.

Why on earth would this change not be immediately rolled back out of  
the STABLE branch?  For those on the bleeding edge with CURRENT they  
expect to lose their entire drives, but not STABLE users.

We need to remove -DLOADER_ZFS_SUPPORT from /usr/src/sys/boot/i386/ 
loader/Makefile immediately.

Dan