package/doxygen: add DOXYGEN_CPE_ID_VENDOR

cpe:2.3🅰️doxygen:doxygen is a valid CPE identifier for this package:

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

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 44b76cc49f)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/doxygen/doxygen.mk

@@ -9,6 +9,7 @@ DOXYGEN_SOURCE = doxygen-$(DOXYGEN_VERSION).src.tar.gz
 DOXYGEN_SITE = http://doxygen.nl/files
 DOXYGEN_LICENSE = GPL-2.0
 DOXYGEN_LICENSE_FILES = LICENSE
+DOXYGEN_CPE_ID_VENDOR = doxygen
 HOST_DOXYGEN_DEPENDENCIES = host-flex host-bison
 
 HOST_DOXYGEN_CONF_OPTS += -DBUILD_SHARED_LIBS=OFF