poppler: add explicit libglib2 support

Evince needs poppler-glib support (when poppler is enabled, for PDF
reading support), so add explicit handling to the package.
And poppler-glib requires cairo output, hence the conditional on both
libglib2 and cairo to enable it.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/poppler/poppler.mk

@@ -28,6 +28,13 @@ else
 POPPLER_CONF_OPTS += --enable-cms=none
 endif
 
+ifeq ($(BR2_PACKAGE_CAIRO)$(BR2_PACKAGE_LIBGLIB2),yy)
+POPPLER_CONF_OPTS += --enable-poppler-glib
+POPPLER_DEPENDENCIES += libglib2
+else
+POPPLER_CONF_OPTS += --disable-poppler-glib
+endif
+
 ifeq ($(BR2_PACKAGE_TIFF),y)
 POPPLER_CONF_OPTS += --enable-libtiff
 # Help poppler to find libtiff in static linking scenarios