icu: update to 61.1

Maintainer: me
Compile tested: ar71xx, LEDE trunk r5488-893a1ed
Run tested: NONE

Description:
ICU 61 upgrades to CLDR 33 locale data, has a new Java implementation
for number and currency parsing, and includes many small API additions,
improvements, and bug fixes.
(includes security fix CVE-2017-17484,CVE-2017-15422)

Signed-off-by: Hirokazu MORIKAWA <morikw2@gmail.com>

libs/icu/Makefile

@@ -8,12 +8,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=icu4c
-PKG_VERSION:=60.2
+PKG_VERSION:=61.1
 PKG_RELEASE:=1
 
-PKG_SOURCE:=$(PKG_NAME)-60_2-src.tgz
+PKG_SOURCE:=$(PKG_NAME)-61_1-src.tgz
 PKG_SOURCE_URL:=http://download.icu-project.org/files/$(PKG_NAME)/$(PKG_VERSION)
-PKG_HASH:=f073ea8f35b926d70bb33e6577508aa642a8b316a803f11be20af384811db418
+PKG_HASH:=d007f89ae8a2543a53525c74359b65b36412fa84b3349f1400be6dcf409fafef
 
 PKG_LICENSE:=ICU-1.8.1+
 PKG_LICENSE_FILES:=LICENSE