package/qemu: add optional vnc support

Signed-off-by: Jared Bents <jared.bents@rockwellcollins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/qemu/qemu.mk

@@ -98,6 +98,27 @@ else
 QEMU_OPTS += --disable-libusb
 endif
 
+ifeq ($(BR2_PACKAGE_LIBVNCSERVER),y)
+QEMU_OPTS += \
+	--enable-vnc \
+	--disable-vnc-sasl
+QEMU_DEPENDENCIES += libvncserver
+ifeq ($(BR2_PACKAGE_LIBPNG),y)
+QEMU_OPTS += --enable-vnc-png
+QEMU_DEPENDENCIES += libpng
+else
+QEMU_OPTS += --disable-vnc-png
+endif
+ifeq ($(BR2_PACKAGE_JPEG),y)
+QEMU_OPTS += --enable-vnc-jpeg
+QEMU_DEPENDENCIES += jpeg
+else
+QEMU_OPTS += --disable-vnc-jpeg
+endif
+else
+QEMU_OPTS += --disable-vnc
+endif
+
 ifeq ($(BR2_PACKAGE_NETTLE),y)
 QEMU_OPTS += --enable-nettle
 QEMU_DEPENDENCIES += nettle
@@ -140,7 +161,6 @@ define QEMU_CONFIGURE_CMDS
 			--disable-bsd-user \
 			--disable-containers \
 			--disable-xen \
-			--disable-vnc \
 			--disable-virtfs \
 			--disable-brlapi \
 			--disable-curses \