polarssl: security bump to version 1.2.19

Fix bug in certificate validation that caused valid chains to be
rejected when the first intermediate certificate has
pathLenConstraint=0.

Removed potential leak in rsa_rsassa_pkcs1_v15_sign().

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/polarssl/polarssl.hash

@@ -1,2 +1,2 @@
-# From https://tls.mbed.org/tech-updates/releases/mbedtls-2.2.0-2.1.3-1.3.15-and-polarssl.1.2.18-released
-sha256	63c4ed4d9f6a241088e2287958f265403f874248d6a98b98f27cd3aa2f90f030	polarssl-1.2.18-gpl.tgz
+# From https://tls.mbed.org/tech-updates/releases/mbedtls-2.2.1-2.1.4-1.3.16-and-polarssl.1.2.19-released
+sha256	24cb1608a160101ead3c7240f35fc447fe7880cd60f7ed6c9db7a1d773ccd4b8	polarssl-1.2.19-gpl.tgz

package/polarssl/polarssl.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 POLARSSL_SITE = https://tls.mbed.org/code/releases
-POLARSSL_VERSION = 1.2.18
+POLARSSL_VERSION = 1.2.19
 POLARSSL_SOURCE = polarssl-$(POLARSSL_VERSION)-gpl.tgz
 POLARSSL_CONF_OPTS = \
 	-DENABLE_PROGRAMS=$(if $(BR2_PACKAGE_POLARSSL_PROGRAMS),ON,OFF)