after dropping the xen-qemu, the build dependencies are less insane,
especially when xen-qemu-traditional is also disabled :)
# Xen Makefiles)
# - fix %doc - some files are installed in docdir both by make install and %d,
# other are installed once
-# - now the build dependencies are insane (because of what qemu can use)
-# we should make them optional or get rid of them all properly
#
# Conditional build:
%bcond_without qemu_traditional # without qemu-xen-traditional