package/putty: add PUTTY_CPE_ID_VENDOR

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

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

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/putty/putty.mk

@@ -8,6 +8,7 @@ PUTTY_VERSION = 0.74
 PUTTY_SITE = http://the.earth.li/~sgtatham/putty/$(PUTTY_VERSION)
 PUTTY_LICENSE = MIT
 PUTTY_LICENSE_FILES = LICENCE
+PUTTY_CPE_ID_VENDOR = putty
 PUTTY_CONF_OPTS = --disable-gtktest
 PUTTY_CONF_ENV = CFLAGS="$(TARGET_CFLAGS) -Wno-error"