c-ares: update to latest for security fixes

Four fixes tagged as security, full changelog at https://c-ares.haxx.se/changelog.html#1_17_0
Includes fix for CVE-2020-8277

Signed-off-by: Karl Palsson <karlp@tweak.net.au>

libs/c-ares/Makefile

@@ -9,12 +9,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=c-ares
-PKG_VERSION:=1.16.1
-PKG_RELEASE:=2
+PKG_VERSION:=1.17.1
+PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://c-ares.haxx.se/download
-PKG_HASH:=d08312d0ecc3bd48eee0a4cc0d2137c9f194e0a28de2028928c0f6cae85f86ce
+PKG_HASH:=d73dd0f6de824afd407ce10750ea081af47eba52b8a6cb307d220131ad93fc40
 
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=LICENSE.md