package/sylpheed: add SYLPHEED_CPE_ID_VENDOR

cpe:2.3:a:sylpheed_project:sylpheed is a valid CPE identifier for this
package:

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

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

package/sylpheed/sylpheed.mk

@@ -10,6 +10,7 @@ SYLPHEED_SOURCE = sylpheed-$(SYLPHEED_VERSION).tar.xz
 SYLPHEED_SITE = http://sylpheed.sraoss.jp/sylpheed/v$(SYLPHEED_VERSION_MAJOR)
 SYLPHEED_LICENSE = GPL-2.0+ (executables), LGPL-2.1+ (library, attachment plugin)
 SYLPHEED_LICENSE_FILES = COPYING COPYING.LIB
+SYLPHEED_CPE_ID_VENDOR = sylpheed_project
 SYLPHEED_CONF_OPTS = --disable-gtkspell --disable-gpgme
 SYLPHEED_DEPENDENCIES = host-pkgconf libgtk2