kqemu.o is compiled even if kqemu support is disabled. This is useless
(kqemu.o should provide nothing that is actually used in that case) and
slightly confusing. So introduce CONFIG_KQEMU for optionally compiling
kqemu.o.
Signed-off-by: NPaul Bolle <pebolle@tiscali.nl>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7185 c046a42c-6fe2-441c-8c8c-71466251a162