package/speex: add SPEEX_CPE_ID_VENDOR

cpe:2.3:a:xiph:speex is a valid CPE identifier for this package:

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

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/speex/speex.mk

@@ -8,6 +8,7 @@ SPEEX_VERSION = 1.2.0
 SPEEX_SITE = https://downloads.xiph.org/releases/speex
 SPEEX_LICENSE = BSD-3-Clause
 SPEEX_LICENSE_FILES = COPYING
+SPEEX_CPE_ID_VENDOR = xiph
 SPEEX_INSTALL_STAGING = YES
 SPEEX_DEPENDENCIES = host-pkgconf libogg
 SPEEX_CONF_OPTS = \