[issue1140] installkernel POSTFIX directive

[Matthew Dillon]

:    make installkenrel KERNCONF=FUBAR DESTKERNDIR=/mnt/fubar
:
:	Installs as /mnt/fubar/kernel and /mnt/fubar/kernel.smp

    Oops, I meant /mnt/fubar/kernel and /mnt/fubar/modules for this
    example.

					-Matt