Check ecl building + sdl2 is working tests

Hi everyone, since mostly everyone is building jam-no-theme in ecl common lisp, but some people get errors, I would like everyone to try these three build tests:

https://itch.io/post/7918395

they also show how building applications / command line applications and linking C libraries works in idiomatic ECL.

Corrolary mastodon toot:

https://mastodon.sdf.org/@screwtape/110494065796345224

Source on the gopher:

https://gopher.floodgap.com/gopher/gw.lite?=tilde.institute+70+312f7e7363726577746170652f65636c2d6275696c642d74657374732f

gopher://tilde.institute/1/~screwtape/ecl-build-tests/

Thanks!