package/python-gnupg: add PYTHON_GNUPG_CPE_ID_VENDOR

cpe:2.3:a:python:python-gnupg 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%3Apython-gnupg

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/python-gnupg/python-gnupg.mk

@@ -8,6 +8,7 @@ PYTHON_GNUPG_VERSION = 0.4.8
 PYTHON_GNUPG_SITE = https://files.pythonhosted.org/packages/b1/90/75e15ead9693028c05fc7abd25c756c0d1da27bf04a27d6f5c4139d8ee10
 PYTHON_GNUPG_LICENSE = BSD-3-Clause
 PYTHON_GNUPG_LICENSE_FILES = LICENSE.txt
+PYTHON_GNUPG_CPE_ID_VENDOR = python
 PYTHON_GNUPG_SETUP_TYPE = setuptools
 
 $(eval $(python-package))