package/python-flask: add CPE variables

cpe:2.3:a:palletsprojects:flask is a valid CPE identifier for this
package:

  https://nvd.nist.gov/products/cpe/search/results?namingFormat=2.3&keyword=cpe%3A2.3%3Aa%3Apalletsprojects%3Aflask

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/python-flask/python-flask.mk

@@ -10,5 +10,7 @@ PYTHON_FLASK_SITE = https://files.pythonhosted.org/packages/4e/0b/cb02268c90e675
 PYTHON_FLASK_SETUP_TYPE = setuptools
 PYTHON_FLASK_LICENSE = BSD-3-Clause
 PYTHON_FLASK_LICENSE_FILES = LICENSE.rst docs/license.rst
+PYTHON_FLASK_CPE_ID_VENDOR = palletsprojects
+PYTHON_FLASK_CPE_ID_PRODUCT = flask
 
 $(eval $(python-package))