Revert "package/putty: Ignore CVE-2021-33500"

This reverts commit 01063c4291a7300285ad9ec044b94968dd6c2d09.

With putty now bumped to 0.75, this can be dropped.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/putty/putty.mk

@@ -11,9 +11,6 @@ PUTTY_LICENSE_FILES = LICENCE
 PUTTY_CPE_ID_VENDOR = putty
 PUTTY_CONF_OPTS = --disable-gtktest
 
-# Windows only, fixed for Windows with 0.75
-PUTTY_IGNORE_CVES += CVE-2021-33500
-
 ifeq ($(BR2_PACKAGE_LIBGTK2),y)
 PUTTY_CONF_OPTS += --with-gtk=2
 PUTTY_DEPENDENCIES += libgtk2