Add instructions on how to install SDL or SDL2 for macOS, Linux and
Debian for:
2005/jetro
2014/maffiodo1
2018/giles
Put variables and instructions into the top level `var.mk` file.
The problem was that SDL2 removed two functions that are used in this
code. Since SDL1 is still available and since changing it to SDL2 is
more complicated than it is worth I've decided to keep it as SDL1,
changing sdl2-config to sdl-config. Nevertheless it actually segfaults
or it does at least in macOS. I have not tested it in linux but I will
in time. At this point I will try debugging it but at least now it will
link.
Typo fixes in README.md and update the reference to SDL2 to be SDL1. I
noted that currently it does not work at least under macOS. I've not yet
put it in the bugs.md file but will in time if I don't get it to work
(again once I test it under linux).
As per a request on GitHub the LESSECHO variable has been removed from
all the Makefiles. It was only in the 2019 and 2020 Makefiles as well as
var.mk.
Landon Curt Noll