dec21140 network driver

[Jay Kulpinski]

Is the dec21140 driver in rtems-4.5.0-beta3/c/src/libchip/network/dec21140.c 
the latest version?  This uses busy polling in sendpacket() to wait for 
transmission and memcpy to build a contiguous packet from the mbuf list.  
I thought Eric V. (or was it Emmanuel?) had merged in the changes I made 
to wait on a semaphore and use scatter/gather DMA to send the packet,
eliminating the copy.  Was there a problem that led to reverting to the
older version?