add: uxn

[arbormoss]

This adds tooling for uxn, the uxn half of the uxn/varvara computing stack.

This is a draft dependent on a rolling release version in addition to the current permanently frozen stable version.

See this Discord message for the full versioning issue or this backup of the conversion for conversation on the versioning issue.

The stable version is currently functional.

Implementing the nightly version is TODO at time of initial draft PR.

This should close #8538

[arbormoss]

This PR is ready.

The files are currently in uxn/stable in anticipation of a nightly.

uxn nightly is dependent on a sourcehut nightly macro, which has some issues in #8538 .

This PR was tested on terra-43 because of issues right now with frawhide.

[metcya]

Is this needed?

Looking around build.sh, you might be able to just patch CFLAGS to include the -g flag.

[arbormoss]

Patching -g directly doesn't work because if the internal debug variable isn't set to 1 it will make sure to not debug:

# ./build.sh
. . .
if [ $debug = 1 ];
then
	echo "[debug]"
	CFLAGS="${CFLAGS} -DDEBUG -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined"
else
	CFLAGS="${CFLAGS} -DNDEBUG -O2 -g0 -s"
fi
. . .

I just pushed a fix that just uses sed to set the debug var within build.sh.

[metcya]

In that case I think it would be better to keep the %global debug_package %{nil} than set the debug var. I think its better to not have the debug package than to distribute an unoptimized debug build of the package.