Add call_fp (call function pointer). Requested in #39. #288

	name: Run tests
	on: [push, pull_request]

	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- name: Install Rust toolchain
	uses: actions-rs/toolchain@v1
	with:
	toolchain: stable

	- name: Install SDL2
	run: \|
	sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu `lsb_release -sc` main universe restricted multiverse"
	sudo apt-get update -y -qq
	sudo apt-get install libsdl2-dev

	- name: Build API
	working-directory: ./api
	run: cargo build

	- name: Test VM
	working-directory: ./vm
	run: RUST_BACKTRACE=1 cargo test

	- name: Test NCC
	working-directory: ./ncc
	run: \|
	pwd
	ls -al
	RUST_BACKTRACE=1 cargo test

	- name: Test NCC command-line arguments
	working-directory: ./ncc
	run: \|
	cargo run examples/chess.c
	cargo run -- -o output_file.asm examples/chess.c
	cargo run -- -E examples/crc32.c > /dev/null
	cargo run -- -DTEST tests/test_macro.c

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