debloat the cmakelists.txt and add a bunch of customization for building #114

	name: CrossBuild

	on:
	push:
	branches: [ master ]
	tags:
	- 'v*'
	pull_request:
	branches: [ master ]

	permissions:
	contents: read

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	arch: [ i686, arm, aarch64, riscv64, powerpc, powerpc64, powerpc64le, s390x, sparc64, m68k, sh4, alpha ]

	steps:
	- uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1

	- name: Install cross tools
	run: \|
	sudo apt-get update
	sudo apt-get install -y sudo qemu-user gdb zstd dwarfdump {gcc,g++}-10-{i686,aarch64,riscv64,powerpc,powerpc64,powerpc64le,s390x,sparc64,m68k,sh4,alpha}-linux-gnu {gcc,g++}-10-arm-linux-gnueabihf
	sudo ln -sf /usr/bin/arm-linux-gnueabihf-gcc-10 /usr/bin/arm-linux-gnu-gcc-10
	sudo ln -sf /usr/bin/arm-linux-gnueabihf-g++-10 /usr/bin/arm-linux-gnu-g++-10
	sudo ln -sf /usr/arm-linux-gnueabihf /usr/arm-linux-gnu

	- name: Build
	run: \|
	mkdir -p ${{github.workspace}}/build
	cd ${{github.workspace}}/build
	env CXX=/usr/bin/${{matrix.arch}}-linux-gnu-g++-10 CC=/usr/bin/${{matrix.arch}}-linux-gnu-gcc-10 cmake .. -DSPM_BUILD_TEST=ON -DSPM_ENABLE_SHARED=OFF -DCMAKE_FIND_ROOT_PATH=/usr/${{matrix.arch}}-linux-gnu -DSPM_CROSS_SYSTEM_PROCESSOR=${{matrix.arch}}
	make -j$(nproc)

	- name: Test on QEMU
	if: matrix.arch != 'sparc64' && matrix.arch != 'm68k' && matrix.arch != 'sh4'
	run: \|
	cd ${{github.workspace}}/build
	qemu_arch=`echo ${{matrix.arch}} \| sed -e s/powerpc/ppc/ -e s/686/386/`
	qemu-${qemu_arch} -L /usr/${{matrix.arch}}-linux-gnu src/spm_test

Provide feedback