add support for an alternate BIOS path

kvm-manager

@@ -71,6 +71,7 @@ up() {
         /usr/bin/kvm $KVMARGS \
         -smp "${SMP:-1}" \
         -nographic \
+        -L "${BIOS_PATH:-/usr/share/kvm/}" \
         -name "$VMNAME" \
         -m "$RAM" \
         -net nic,"macaddr=$MAC" \