php7: upgrade to 7.1.7

This fixes several CVEs:
 - in mbstring: CVE-2017-9224, CVE-2017-9226, CVE-2017-9227,
                CVE-2017-9228, CVE-2017-9229
 - in gd: CVE-2017-7890

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

lang/php7/Makefile

@@ -6,8 +6,8 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=php
-PKG_VERSION:=7.1.6
-PKG_RELEASE:=2
+PKG_VERSION:=7.1.7
+PKG_RELEASE:=1
 
 PKG_MAINTAINER:=Michael Heimpold <mhei@heimpold.de>
 
@@ -16,8 +16,7 @@ PKG_LICENSE_FILES:=LICENSE
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=http://www.php.net/distributions/
-PKG_MD5SUM:=eafc7a79cc8cc62c9292c96f9c9ccf90
-PKG_HASH:=01584dc521ab7ec84b502b61952f573652fe6aa00c18d6d844fb9209f14b245b
+PKG_HASH:=0d42089729be7b2bb0308cbe189c2782f9cb4b07078c8a235495be5874fff729
 
 PKG_FIXUP:=libtool autoreconf
 PKG_BUILD_PARALLEL:=1