sdl: Update documentation links to remove TODO marks on pages that ex… #149

	name: test-older-versions-build
	on: [push]
	jobs:
	test-older-versions-build:
	strategy:
	matrix:
	SDL_VERSION: [2.0.8, 2.0.9, 2.0.10, 2.0.12, 2.0.14, 2.0.16, 2.0.18, 2.0.20, 2.0.22]
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-go@v3
	with:
	go-version: '1.13.15'
	- run: go version

	- name: Cache Go
	id: cache-go
	uses: actions/cache@v3
	with:
	path: \|
	~/.cache/go-build
	~/go/pkg/mod
	key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
	restore-keys: \|
	${{ runner.os }}-go-

	- name: set PKG_CONFIG_PATH environment variable
	run: \|
	echo "PKG_CONFIG_PATH=$HOME/.local/lib/pkgconfig:$PKG_CONFIG_PATH" >> $GITHUB_ENV

	- name: Download, build, and install SDL2 packages
	run: \|
	wget https://www.libsdl.org/release/SDL2-${{ matrix.SDL_VERSION }}.tar.gz
	tar xf SDL2-${{ matrix.SDL_VERSION }}.tar.gz
	cd SDL2-${{ matrix.SDL_VERSION }}
	./configure --prefix=$HOME/.local
	make install
	cd ..

	- name: Test if Go-SDL2 works with the SDL2 package
	run: \|
	go build ./sdl

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