package/python-mako: add missing dependency on python-markupsafe

Mako imports markupsafe so it needs to be selected when selecting
BR2_PACKAGE_PYTHON_MAKO.

Fixes:

  https://bugs.busybox.net/show_bug.cgi?id=15628

Signed-off-by: Sebastian Weyer <sebastian.weyer@smile.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/python-mako/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_PYTHON_MAKO
 	bool "python-mako"
+	select BR2_PACKAGE_PYTHON_MARKUPSAFE # runtime
 	help
 	  Mako is a template library written in Python. It provides a
 	  familiar, non-XML syntax which compiles into Python modules