package/ruby: add RUBY_CPE_ID_VENDOR

cpe:2.3:a:ruby-lang:ruby is a valid CPE identifier for this package:

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

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

package/ruby/ruby.mk

@@ -19,6 +19,7 @@ HOST_RUBY_CONF_OPTS = \
 	--without-gmp
 RUBY_LICENSE = Ruby or BSD-2-Clause, BSD-3-Clause, others
 RUBY_LICENSE_FILES = LEGAL COPYING BSDL
+RUBY_CPE_ID_VENDOR = ruby-lang
 # 0001-fix-default-coroutine-selection.patch
 RUBY_AUTORECONF = YES