The following makes BPF and tcpdump work (again or finally?), tho'
personally I'm tempted to replace pmax/dev/if_le.c with the Alpha
driver and some `millicode' to copy to/from the funky DMA-padded
Decstation buffers.

I've tested it on a 5k/240 and 200 it works for me.
I can't get to sun-lamp right now or I'd commit this.


*** if_le.c.DIST	Wed May  3 03:05:19 1995
--- if_le.c	Wed May 24 17:56:04 1995
***************
*** 767,773 ****
--- 767,780 ----
  	 * If so, hand off the raw packet to enet.
  	 */
  	if (le->sc_if.if_bpf) {
+ 		M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT);
+ 		if (m == 0)
+ 			return;
+ 		bcopy(&et, mtod(m, void *), sizeof(struct ether_header));
+ 
  		bpf_mtap(le->sc_if.if_bpf, m);
+ 
+ 		m_adj(m, sizeof(struct ether_header));
  
  		/*
  		 * Keep the packet if it's a broadcast or has our