package/python-pillow: add CPE variables

cpe:2.3:a:python:pillow is a valid CPE identifier for this package:

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

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

package/python-pillow/python-pillow.mk

@@ -9,6 +9,8 @@ PYTHON_PILLOW_SITE = https://files.pythonhosted.org/packages/2b/06/93bf1626ef368
 PYTHON_PILLOW_SOURCE = Pillow-$(PYTHON_PILLOW_VERSION).tar.gz
 PYTHON_PILLOW_LICENSE = PIL Software License
 PYTHON_PILLOW_LICENSE_FILES = LICENSE
+PYTHON_PILLOW_CPE_ID_VENDOR = python
+PYTHON_PILLOW_CPE_ID_PRODUCT = pillow
 PYTHON_PILLOW_SETUP_TYPE = setuptools
 PYTHON_PILLOW_BUILD_OPTS = --disable-platform-guessing