package/qemu: do not build the guest agent for the host

It does not make sense to build it for the host.

Signed-off-by: Carlos Santos <unixmania@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 97064a5eaa5b235ae754dd0abe639d11a8bff0f6)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/qemu/qemu.mk

@@ -474,6 +474,7 @@ define HOST_QEMU_CONFIGURE_CMDS
 		--disable-vnc-sasl \
 		--enable-slirp \
 		--enable-tools \
+		--disable-guest-agent \
 		$(HOST_QEMU_OPTS)
 endef