[Xcb] libxcb on Windows must be linked against libws2_32

[Vincent Torri]

hey,

as libxcb on Windows uses winsock2, one must link against libws2_32. One 
possible solution:


mingw*)
 	have_win32="yes"
 	lt_enable_auto_import="-Wl,--enable-auto-import"
+	NEEDED_LIBS="${NEEDED_LIBS} -lws2_32"
  	;;

Vincent