Add manylinux build scripts

Older glibc for compatibility.

Author: thewtex

.gitignore

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+dockcross-x64
+castxml-linux.tar.gz
+castxml-linux-aarch64.tar.gz

manylinux-build.sh

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+#!/usr/bin/env bash
+
+set -e -x -o pipefail
+
+
+dockcross_version=20240404-2c6c0a5
+
+podman pull docker.io/dockcross/manylinux2014-x64:$dockcross_version
+podman run --rm docker.io/dockcross/manylinux2014-x64:$dockcross_version > ./dockcross-x64
+chmod +x ./dockcross-x64
+
+./dockcross-x64 cmake -Bbuild -S. -GNinja
+./dockcross-x64 ninja -Cbuild
+
+pushd build
+tar cvf ../castxml-linux.tar castxml
+gzip -9 ../castxml-linux.tar
+popd
+rm -rf build
+
+
+manylinux_version=2024-04-02-96b33b9
+
+cat << EOF
+
+Note!
+Need to run:
+
+  sudo podman run --privileged --rm tonistiigi/binfmt --install all
+
+once before running the following commands on an amd64 system.
+
+EOF
+
+podman pull quay.io/pypa/manylinux2014_aarch64:$manylinux_version
+podman run -it --rm -v $(pwd):/work quay.io/pypa/manylinux2014_aarch64:$manylinux_version /work/manylinux-internal.sh

manylinux-internal.sh

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+#!/usr/bin/env bash
+
+set -e -x -o pipefail
+
+# This script is executed inside the manylinux container to build castxml for an aarch64 linux system
+cd /work
+
+git clone https://github.com/ninja-build/ninja.git
+pushd ninja
+git checkout release
+cmake -DBUILD_TESTING:BOOL=OFF -DCMAKE_BUILD_TYPE:STRING=Release -Bbuild-cmake -S.
+cmake --build build-cmake --parallel 8
+cp build-cmake/ninja /usr/local/bin/
+popd
+rm -rf ninja
+
+cmake -Bbuild -S. -GNinja
+ninja -Cbuild
+
+pushd build
+tar cvf ../castxml-linux-aarch64.tar castxml
+gzip -9 ../castxml-linux-aarch64.tar
+popd
+rm -rf build