configure: disable scsi stroage driver on non-Linux

Even though scsi storage driver builds fine on non-Linux, it
will not work properly because it relies on Linux procfs, so
disable that in configure if we're not building for Linux.

configure.ac

@@ -192,6 +192,7 @@ if test $with_linux = no; then
         with_lxc=no
     fi
     with_dtrace=no
+    with_storage_scsi=no
 fi
 
 if test $with_freebsd = yes; then