package/mbedtls: security bump to version 2.16.4

Fix CVE-2019-18222: Our bignum implementation is not constant
time/constant trace, so side channel attacks can retrieve the blinded
value, factor it (as it is smaller than RSA keys and not guaranteed to
have only large prime factors), and then, by brute force, recover the
key. Reported by Alejandro Cabrera Aldaya and Billy Brumley.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit a7186d0913f4df2f86439abfdadbaec60f359818)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mbedtls/mbedtls.hash

@@ -1,5 +1,5 @@
-# From https://tls.mbed.org/tech-updates/releases/mbedtls-2.16.3-and-2.7.12-released
-sha1	dce8550f8f9465f3aea44cb7d0f9d0ba8140034a	mbedtls-2.16.3-apache.tgz
-sha256	ec1bee6d82090ed6ea2690784ea4b294ab576a65d428da9fe8750f932d2da661	mbedtls-2.16.3-apache.tgz
+# From https://tls.mbed.org/tech-updates/releases/mbedtls-2.16.4-and-2.7.13-released
+sha1	e446cbac7d24fc3ff1b1c4ee7c021694ede86db6	mbedtls-2.16.4-apache.tgz
+sha256	3441f32bda9c8ef58acc9e18028d09eb9c17d199eb27141bec074905152fb2fb	mbedtls-2.16.4-apache.tgz
 # Locally calculated
 sha256	cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30	apache-2.0.txt

package/mbedtls/mbedtls.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 MBEDTLS_SITE = https://tls.mbed.org/code/releases
-MBEDTLS_VERSION = 2.16.3
+MBEDTLS_VERSION = 2.16.4
 MBEDTLS_SOURCE = mbedtls-$(MBEDTLS_VERSION)-apache.tgz
 MBEDTLS_CONF_OPTS = \
 	-DENABLE_PROGRAMS=$(if $(BR2_PACKAGE_MBEDTLS_PROGRAMS),ON,OFF) \