support for ppc64

Currently, Maxscale build dependency install scripts do not support ppc64le architecture:

install_npm.sh should detect ppc64, something like:

#!/bin/bash

function is_arm() {

    [ "$(arch)" == "aarch64" ]

}

function is_ppc() {

    [ "$(arch)" == "ppc64le" ]

}

if is_arm

then

    node_arch=arm64

else

    node_arch=x64

fi

if is_ppc

then

    node_arch=ppc64le

fi

# NodeJS

node_version=16.16.0

wget --quiet https://nodejs.org/dist/v${node_version}/node-v${node_version}-linux-${node_arch}.tar.gz

tar -axf node-v${node_version}-linux-${node_arch}.tar.gz

sudo cp -t /usr -r node-v${node_version}-linux-${node_arch}/*

install_cmake.sh - there is no ppc64le build of cmake at https://github.com/Kitware/CMake/releases/, but currently we build Maxscale only for RHEL9 which has proper cmake in the distro repo

Also in case of CentOS 9 Steam the 'crb' repo should be enabled to allow unixODBC-devel and lua-devel installation (See install_build_depends.sh and install_test_build_depends.sh)

Changes in the install dependency scripts are need to allow ppc64le builds in the CI