Make sure winsock.h is included in serial.cc and eth_win32.cc
Including winsock.h not needed in pc_system.cc
Don't specify architecture in gcc 4.7+ example


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@11918 6c8e4198-a580-4521-a02f-c9ae86df1db9