package/enscript: add ENSCRIPT_CPE_ID_VENDOR

cpe:2.3:a:gnu:enscript is a valid CPE identifier for this package:

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

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/enscript/enscript.mk

@@ -8,6 +8,7 @@ ENSCRIPT_VERSION = 1.6.6
 ENSCRIPT_SITE = $(BR2_GNU_MIRROR)/enscript
 ENSCRIPT_LICENSE = GPL-3.0+
 ENSCRIPT_LICENSE_FILES = COPYING
+ENSCRIPT_CPE_ID_VENDOR = gnu
 
 # Enable pthread threads if toolchain supports threads
 ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)