package/dovecot: remove stale IGNORE_CVES

Since Buildroot commit [1] the CVEs are no longer matched to CPEs with
versions using '-'.

These IGNORE_CVES entry introduced in [2] is then no longer matched to
the dovecot package.

For more information, see the explanation in commit [1].

[1] 35f376d88e support/scripts/cve.py: fix CPE matching
[2] 948e71689a package/dovecot: ignore CVE-2016-4983

Signed-off-by: Thomas Perale <thomas.perale@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 9dbd14df2291b5c6566d7fcd73c3934b931aed1a)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

package/dovecot/dovecot.mk

@@ -21,12 +21,7 @@ DOVECOT_DEPENDENCIES = \
 	$(if $(BR2_PACKAGE_LIBICONV),libiconv) \
 	openssl
 
-# CVE-2016-4983 is an issue in a postinstall script in the dovecot rpm, which
-# is part of the Red Hat packaging and not part of upstream dovecot
-DOVECOT_IGNORE_CVES += CVE-2016-4983
-
 # 0001-auth-Fix-handling-passdbs-with-identical-driver-args.patch
-
 # Note: this ignore CVE entry is reported as stale by pkg-stats, but
 # the NVD database is incorrect:
 # https://lore.kernel.org/buildroot/20250517181815.02ce0393@windsurf/