package/libvips: add librsvg optional dependency

librsvg is an optional dependency which is enabled by default since
version 8.3.0 and
https://github.com/libvips/libvips/commit/153886d2eb71eebcdca860cb691d8fbb976ad816

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit adc0e0c6afc2011e6ef4d59a93c42f24399b8279)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libvips/libvips.mk

@@ -68,6 +68,13 @@ else
 LIBVIPS_CONF_OPTS += --without-png
 endif
 
+ifeq ($(BR2_PACKAGE_LIBRSVG),y)
+LIBVIPS_CONF_OPTS += --with-rsvg
+LIBVIPS_DEPENDENCIES += librsvg
+else
+LIBVIPS_CONF_OPTS += --without-rsvg
+endif
+
 ifeq ($(BR2_PACKAGE_POPPLER),y)
 LIBVIPS_CONF_OPTS += --with-poppler
 LIBVIPS_DEPENDENCIES += poppler