Openmodelica's compiler doesn't have access to Standard library when run in CLI

[MMesch]

Describe the bug

When running the Openmodelica compiler omc, it doesn't have access to the modelica standard library. Probably just some entry similar to this one for OMEdit is missing:

nixpkgs/pkgs/applications/science/misc/openmodelica/combined/default.nix

Lines 16 to 21 in 6341419

	postBuild = ''
	wrapProgram $out/bin/OMEdit \
	--prefix PATH : ${lib.makeBinPath [ gnumake stdenv.cc ]} \
	--prefix LIBRARY_PATH : "${lib.makeLibraryPath [ blas lapack ]}" \
	--set-default OPENMODELICALIBRARY "${openmodelica.omlibrary}/lib/omlibrary"
	'';

Steps To Reproduce

No time right now but I wanted to report in parallel to #173138 so that both could be fixed at the same time. I will add a detailed description later if required.

Expected behavior

The omc binary should have access to the Open Modelica library as well (e.g. through the associated environment variable)

Notify maintainers

@balodja
@smironov

[balodja]

Somebody is finally interested in OM on the NixOS! Thanks, I'll take a look.