package/libvpx: add LIBVPX_CPE_ID_VENDOR

cpe:2.3:a:webmproject:libvpx is a valid CPE identifier for this package:

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

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit cb6ffd93ec5c89ab90a2d4efd032ef4b774070b4)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libvpx/libvpx.mk

@@ -8,6 +8,7 @@ LIBVPX_VERSION = 1.9.0
 LIBVPX_SITE = $(call github,webmproject,libvpx,v$(LIBVPX_VERSION))
 LIBVPX_LICENSE = BSD-3-Clause
 LIBVPX_LICENSE_FILES = LICENSE PATENTS
+LIBVPX_CPE_ID_VENDOR = webmproject
 LIBVPX_INSTALL_STAGING = YES
 
 # ld is being used with cc options. therefore, pretend ld is cc.