package/postgis: add POSTGIS_CPE_ID_VENDOR

cpe:2.3:a:postgis:postgis is a valid CPE identifier for this package:

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

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

package/postgis/postgis.mk

@@ -10,6 +10,7 @@ POSTGIS_SITE = https://download.osgeo.org/postgis/source
 POSTGIS_MAKE = $(MAKE1)
 POSTGIS_LICENSE = GPL-2.0+ (PostGIS), BSD-2-Clause, MIT, Apache-2.0, ISC, BSL-1.0, CC-BY-SA-3.0
 POSTGIS_LICENSE_FILES = LICENSE.TXT
+POSTGIS_CPE_ID_VENDOR = postgis
 # configure.ac is patched so need to run autoreconf
 POSTGIS_AUTORECONF = YES