tools/libressl: Add PKG_CPE_ID for proper CVE tracking

Signed-off-by: Rosen Penev <rosenp@gmail.com>

tools/libressl/Makefile

@@ -12,6 +12,8 @@ PKG_VERSION:=2.8.1
 PKG_HASH:=334bf7050f1db4087feebb30571ec13d9fa975bf05d6003ce3ab6d7d2452cf42
 PKG_RELEASE:=1
 
+PKG_CPE_ID:=cpe:/a:openbsd:libressl
+
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://mirror.ox.ac.uk/pub/OpenBSD/LibreSSL \
 	http://ftp.jaist.ac.jp/pub/OpenBSD/LibreSSL \