package/libebml: add LIBEBML_CPE_ID_VENDOR

cpe:2.3:a:matroska:libebml is a valid CPE identifier for this package:

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

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

package/libebml/libebml.mk

@@ -10,5 +10,6 @@ LIBEBML_SITE = http://dl.matroska.org/downloads/libebml
 LIBEBML_INSTALL_STAGING = YES
 LIBEBML_LICENSE = LGPL-2.1+
 LIBEBML_LICENSE_FILES = LICENSE.LGPL
+LIBEBML_CPE_ID_VENDOR = matroska
 
 $(eval $(cmake-package))