curl: update to version 7.52.1

This fixes the folowing security problems:

CVE-2016-9586: printf floating point buffer overflow
CVE-2016-9952: Win CE schannel cert wildcard matches too much
CVE-2016-9953: Win CE schannel cert name out of buffer read
CVE-2016-9594: unititialized random

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

package/network/utils/curl/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=curl
-PKG_VERSION:=7.51.0
+PKG_VERSION:=7.52.1
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
@@ -18,7 +18,7 @@ PKG_SOURCE_URL:=http://curl.haxx.se/download/ \
 	ftp://ftp.planetmirror.com/pub/curl/ \
 	http://www.mirrormonster.com/curl/download/ \
 	http://curl.mirrors.cyberservers.net/download/
-PKG_HASH:=7f8240048907e5030f67be0a6129bc4b333783b9cca1391026d700835a788dde
+PKG_HASH:=d16185a767cb2c1ba3d5b9096ec54e5ec198b213f45864a38b3bda4bbf87389b
 
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=COPYING

package/network/utils/curl/patches/310-polarssl-disable-runtime-version-check.patch

@@ -1,6 +1,6 @@
 --- a/lib/vtls/polarssl.c
 +++ b/lib/vtls/polarssl.c
-@@ -646,7 +646,7 @@ void Curl_polarssl_session_free(void *pt
+@@ -657,7 +657,7 @@ void Curl_polarssl_session_free(void *pt
  
  size_t Curl_polarssl_version(char *buffer, size_t size)
  {
@@ -11,7 +11,7 @@
                    version>>24, (version>>16)&0xff, (version>>8)&0xff);
 --- a/lib/vtls/mbedtls.c
 +++ b/lib/vtls/mbedtls.c
-@@ -712,7 +712,7 @@ void Curl_mbedtls_session_free(void *ptr
+@@ -724,7 +724,7 @@ void Curl_mbedtls_session_free(void *ptr
  
  size_t Curl_mbedtls_version(char *buffer, size_t size)
  {