This patch removes all trace of the standalone paravirt framebuffer
daemon. With this there is no longer any requirement for
LibVNCServer. Everything is handled by the QEMU device model. The
xenfb.c and xenfb.h files are now moved (without code change) into
tools/ioemu/hw/ & the temporary Makefile hack from the previous patch
is removed.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>