Do not flush/restart the TX engine after queuing packets, but instead
keep it running (it will stall when out of descriptors), and inform it
about new descriptors available by writing to the TXPOLL request register.
Add more debugging code.
Comment out a printf that was confusing entering ddb output.
Do not try the C++ 2011 test with gcc < 4.8
Initialize a variable that gcc thinks might be used uninitialized.
Fix include order, so the makefile actually does something again.