mbedtls: update to version 2.4.2

This fixes the following security problems:
* CVE-2017-2784: Freeing of memory allocated on stack when validating a public key with a secp224k1 curve
* SLOTH vulnerability
* Denial of Service through Certificate Revocation List

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/libs/mbedtls/Makefile

@@ -8,13 +8,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=mbedtls
-PKG_VERSION:=2.4.0
+PKG_VERSION:=2.4.2
-PKG_RELEASE:=2
+PKG_RELEASE:=1
 PKG_USE_MIPS16:=0
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-gpl.tgz
 PKG_SOURCE_URL:=https://tls.mbed.org/download/
-PKG_HASH:=80eff0e0028f969355d6e34ffdd3dbf4eb2a9367b07ff2f3f70e6d75beee9e3f
+PKG_HASH:=d01f2d5586a52055329d194d909103f445bd2d0b6b2b5f1c830fbf828ac6299f
 
 PKG_BUILD_PARALLEL:=1
 PKG_LICENSE:=GPL-2.0+

package/libs/mbedtls/patches/200-config.patch

@@ -222,7 +222,7 @@
  /**
   * \def MBEDTLS_MD_C
 @@ -2158,7 +2158,7 @@
-  * Caller:  library/mbedtls_md.c
+  * Caller:  library/md.c
   *
   */
 -#define MBEDTLS_RIPEMD160_C