[icu-support] Compiling 57.1 on MacOSX

[giorgio w. <gi...@gm...>]

 I have managed to compile on Linux and Windows without any problems. I
also compiled ICU 49.1 on MacOSX without any problems.

Building 57.1 gives me the following error. What am I missing?

Applications/Xcode.app/Contents/Developer/usr/bin/gnumake[3]: Making `all'
in `common'
   clang++     ...  ustrenum.cpp
In file included from ustrenum.cpp:11:
./utypeinfo.h:28:10: fatal error: 'typeinfo' file not found
#include <typeinfo>  // for 'typeid' to work
         ^
1 error generated.
*** Failed compilation command follows:
----------------------------------------------------------
clang++ -DU_ATTRIBUTE_DEPRECATED= -DU_COMMON_IMPLEMENTATION
-DU_HAVE_STD_STRING=0 -DU_HAVE_ATOMIC=0 -I.
-DDEFAULT_ICU_PLUGINS="/Users/george/projects/cmakeicu/build/lib/icu"  -O3
-W -Wall -pedantic -Wpointer-arith -Wwrite-strings -Wno-long-long
--std=c++0x -Qunused-arguments -Wno-parentheses-equality
-fvisibility=hidden -fno-common -c -MMD -MT ustrenum.d ustrenum.o
ustrenum.ao -o ustrenum.ao ustrenum.cpp