Update CI scripts #1

	name: Build
	on:
	workflow_call:
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	jobs:
	windows:
	runs-on: windows-latest
	steps:
	- uses: ilammy/msvc-dev-cmd@v1
	- name: Build with CMake+MSbuild
	run: \|
	git submodule init
	git submodule update --remote
	./msbuild.bat
	linux:
	runs-on: ubuntu-20.04
	steps:
	- name: Install packages
	run: sudo apt install -y openssh-client mesa-common-dev xorg-dev libxi-dev libxcursor-dev mingw-w64
	- name: Update submodules
	run: \|
	git submodule init
	git submodule update --remote
	- name: Build linux x86_64
	run: make
	- name: Build windows x86_64 (cross)
	run: make cross

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