package/gvfs: enable optional udisks support

Optional udisks support is useful for mounting USB sticks via
pcmanfm.

gvfs meson.build has recognized this udisks2 option for quite
some time, since upstream commit [1] first included in version
1.35.2 (released on 2017-11-13).

[1] cdc33bf54f

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
[Julien: add comment in commit log]
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/gvfs/gvfs.mk

@@ -30,8 +30,7 @@ GVFS_CONF_OPTS = \
 	-Dgoogle=false \
 	-Donedrive=false \
 	-Dmtp=false \
-	-Dsftp=false \
-	-Dudisks2=false
+	-Dsftp=false
 
 ifeq ($(BR2_PACKAGE_AVAHI),y)
 GVFS_DEPENDENCIES += avahi
@@ -157,4 +156,11 @@ GVFS_CONF_OPTS += \
 	-Dtmpfilesdir=no
 endif
 
+ifeq ($(BR2_PACKAGE_UDISKS),y)
+GVFS_DEPENDENCIES += udisks
+GVFS_CONF_OPTS += -Dudisks2=true
+else
+GVFS_CONF_OPTS += -Dudisks2=false
+endif
+
 $(eval $(meson-package))