Pregenerated data for ICU library.

You can regenerate the litte-endian data in the following way:

1. Download ICU source code: https://github.com/unicode-org/icu
2. In icu4c/source directory run ./configure and make.
3. The resulting file will be located at ./data/out/tmp/icudt75l_dat.S

The simplest way to regenerate the big-endian data is to (like above) compile icu on a big-endian system and copy the data:

As most of our computers are not big-endian doing this in a docker container is simplest:

1. Install docker engine and qemu
2. Run docker run -it --memory="16g" --cpus="8" --platform linux/s390x ubuntu:latest

In the S390x docker container or VM:

1. Run apt-get update and apt-get install build-essential python3 python-is-python3 git
2. Download ICU git clone https://github.com/unicode-org/icu.git
3. Checkout the version you want to build
4. Change to the correct directory cd icu/icu4c/source
5. Make sure all scripts have the right permissions chmod +x runConfigureICU configure install-sh
6. Run ./runConfigureICU Linux and make (this can take a while in a docker image...)
7. The resulting file will be located at ./data/out/tmp/icudt75b_dat.S

Motivation: ICU is using complicated two-stage build process that is hard to integrate to the build system of another project.

Reference: https://unicode-org.github.io/icu/userguide/icu4c/build.html#how-to-build-and-install-on-unix