ICU4C: Use GCC for native version even if clang is installed. * src/icu4c.mk: ICU4C seems to prefer clang for building the native version if it is installed on the build system. But it looks like that doesn't work for some reason. When cross-compiling, use GCC for the native version instead.

#!/bin/bash
## bootstrap script
## Run this to generate the configure script

set -e      # halt if unhandled error
aclocal
autoconf    # generate configure script