package/ffmpeg: add FFMPEG_CPE_ID_VENDOR

cpe:2.3:a:ffmpeg:ffmpeg is a valid CPE identifier for this package:

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

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

package/ffmpeg/ffmpeg.mk

@@ -16,6 +16,8 @@ FFMPEG_LICENSE += and GPL-2.0+
 FFMPEG_LICENSE_FILES += COPYING.GPLv2
 endif
 
+FFMPEG_CPE_ID_VENDOR = ffmpeg
+
 FFMPEG_CONF_OPTS = \
 	--prefix=/usr \
 	--enable-avfilter \