package/samba4: add required python deps for AD DC support

Needed due to upstream commit:
https://gitlab.com/samba-team/samba/-/commit/2420b7c6d2038aca33759ca3a7d41240c5f19bf7

Fixes:
http://autobuild.buildroot.net/results/12a/12a74665a2349eacb28c3035bb36a4dce1d740d1/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/samba4/Config.in

@@ -32,6 +32,8 @@ config BR2_PACKAGE_SAMBA4_AD_DC
 	bool "AD DC"
 	depends on BR2_PACKAGE_PYTHON3
 	select BR2_PACKAGE_JANSSON
+	select BR2_PACKAGE_PYTHON_DNSPYTHON
+	select BR2_PACKAGE_PYTHON_MARKDOWN
 	select BR2_PACKAGE_SAMBA4_ADS
 	help
 	  Enable Active Directory Domain Controller functionality.

package/samba4/samba4.mk

@@ -149,7 +149,15 @@ define SAMBA4_INSTALL_TARGET_CMDS
 endef
 
 ifeq ($(BR2_PACKAGE_SAMBA4_AD_DC),y)
-SAMBA4_DEPENDENCIES += jansson
+# host-python-dnspython and host-python-markdown are not strictly
+# needed on the host, but on the target. however, samba's configure
+# tests for their availability on the host.
+SAMBA4_DEPENDENCIES += \
+	jansson \
+	host-python-dnspython \
+	host-python-markdown \
+	python-dnspython \
+	python-markdown
 else
 SAMBA4_CONF_OPTS += --without-ad-dc --without-json
 endif