Remove compiler.h defines from osdep.h

easily from struct buffer.

refer to data outside of our data or stack segments.

addresses.  This will have to be reworked to use physical addresses thanks
to the PXE spec.

symbol.

large symbols have been fixed.

Moved transmit before poll, since typically transmit will be implemented first.

 memory interface has changed.

Use shared symbols.
Correct other symbol violations.

Sort of works; the HTTP stuff is fine but the TCP code seems to be
broken; it doesn't ACK the packets and just hands us the retransmitted
packets instead.