package/libopenmpt: add LIBOPENMPT_CPE_ID_VENDOR

cpe:2.3:a:openmpt:libopenmpt is a valid CPE identifier for this package:

  https://nvd.nist.gov/products/cpe/detail/05979DC5-95A8-40BD-9102-402B69F5AFAA

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libopenmpt/libopenmpt.mk

@@ -9,6 +9,7 @@ LIBOPENMPT_SITE = https://lib.openmpt.org/files/libopenmpt/src
 LIBOPENMPT_SOURCE = libopenmpt-$(LIBOPENMPT_VERSION)+release.autotools.tar.gz
 LIBOPENMPT_LICENSE = BSD-3-Clause
 LIBOPENMPT_LICENSE_FILES = LICENSE
+LIBOPENMPT_CPE_ID_VENDOR = openmpt
 LIBOPENMPT_DEPENDENCIES = host-pkgconf
 
 ifeq ($(BR2_PACKAGE_LIBOPENMPT_OPENMPT123),y)