Use libyajl QEMU JSON support

debian/control

@@ -28,6 +28,7 @@ Build-Depends: cdbs (>= 0.4.90~),
  libcap-ng-dev [linux-any],
  virtualbox-ose [amd64 i386],
  libnl-dev [linux-any],
+ libyajl-dev,
 # For "make check"
  libxml2-utils,
  dnsmasq-base,

debian/rules

@@ -58,6 +58,7 @@ DEB_CONFIGURE_EXTRA_FLAGS :=     \
         $(WITH_OPENVZ)		 \
 	--with-avahi             \
 	--with-sasl              \
+	--with-yajl              \
 	$(WITH_POLKIT)		 \
 	$(WITH_UDEV)		 \
 	--with-storage-fs        \