[SCSI] ifdef out broken fc4 EH code

This code pokes deep into EH internals and duplicates scsi_error.c code
wrongly.  It doesn't compile anymore in scsi-misc, so let's #if 0 out
the code - the driver hasn't worked for more than five years anyway.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>