icu: update to 64.1

ICU 64 updates to Unicode 12 and to CLDR 35 locale data with many additions and corrections

And Workaround for ICU-20531 : https://unicode-org.atlassian.net/browse/ICU-20531

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

libs/icu/patches/001-change_optimization_option.patch

@@ -0,0 +1,13 @@
+--- a/runConfigureICU
++++ b/runConfigureICU
+@@ -239,8 +239,8 @@
+         THE_COMP="the GNU C++"
+         CC=gcc; export CC
+         CXX=g++; export CXX
+-        RELEASE_CFLAGS='-O3'
+-        RELEASE_CXXFLAGS='-O3'
++        RELEASE_CFLAGS=' '
++        RELEASE_CXXFLAGS=' '
+         DEBUG_CFLAGS='-g'
+         DEBUG_CXXFLAGS='-g'
+         ;;