python-django: add RDEPENDS

fix error:
ModuleNotFoundError: No module named 'distutils'

Signed-off-by: Changqing Li <changqing.li@windriver.com>
Acked-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python-django.inc

@@ -28,4 +28,5 @@ RDEPENDS_${PN} += "\
     ${PYTHON_PN}-threading \
     ${PYTHON_PN}-unixadmin \
     ${PYTHON_PN}-xml \
+    ${PYTHON_PN}-distutils \
 "