qemu: assume QEMU_CAPS_MACHINE_KERNEL_IRQCHIP
qemu: assume QEMU_CAPS_MACHINE_KERNEL_IRQCHIP

Even though we only allow this option on x86,
all QEMUs report the command line option.

Added in QEMU v1.1:
6a48ffaaa7 "kvm: Activate in-kernel irqchip support"

Remove the pointless capability.

Signed-off-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>
Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

zippy2/libvirt,zippy2/libvirt,crobinso/libvirt,jfehlig/libvirt,zippy2/libvirt,olafhering/libvirt,jfehlig/libvirt,nertpinx/libvirt,crobinso/libvirt,nertpinx/libvirt,libvirt/libvirt,nertpinx/libvirt,jfehlig/libvirt,olafhering/libvirt,crobinso/libvirt,libvirt/libvirt,olafhering/libvirt,olafhering/libvirt,nertpinx/libvirt,nertpinx/libvirt,zippy2/libvirt,libvirt/libvirt,libvirt/libvirt,crobinso/libvirt,jfehlig/libvirt