Possibility of reducing some file checks during precompilation of jll files

[KristofferC]

Every jll package does the following checks during precompile time

statx(AT_FDCWD, "/home/kc/.julia/packages/GR_jll/k8I6U/src/wrappers/JuliaArtifacts.toml"  ENOENT (No such file or directory)
statx(AT_FDCWD, "/home/kc/.julia/packages/GR_jll/k8I6U/src/wrappers/Artifacts.toml"  ENOENT (No such file or directory)
statx(AT_FDCWD, "/home/kc/.julia/packages/GR_jll/k8I6U/src/wrappers/JuliaProject.toml"  ENOENT (No such file or directory)
statx(AT_FDCWD, "/home/kc/.julia/packages/GR_jll/k8I6U/src/wrappers/Project.toml"  ENOENT (No such file or directory)
statx(AT_FDCWD, "/home/kc/.julia/packages/GR_jll/k8I6U/src/JuliaArtifacts.toml"  ENOENT (No such file or directory)
statx(AT_FDCWD, "/home/kc/.julia/packages/GR_jll/k8I6U/src/Artifacts.toml"  ENOENT (No such file or directory)
statx(AT_FDCWD, "/home/kc/.julia/packages/GR_jll/k8I6U/src/JuliaProject.toml"  ENOENT (No such file or directory)
statx(AT_FDCWD, "/home/kc/.julia/packages/GR_jll/k8I6U/src/Project.toml"  ENOENT (No such file or directory)
statx(AT_FDCWD, "/home/kc/.julia/packages/GR_jll/k8I6U/JuliaArtifacts.toml"  ENOENT (No such file or directory)
statx(AT_FDCWD, "/home/kc/.julia/packages/GR_jll/k8I6U/Artifacts.toml", 

Now, stat is pretty cheap on linux/windows but there have been reports about it being quite slow on Windows (JuliaLang/julia#40570).

Since we know the exact layout of a jll package, it should be no need to have to look through the filesystem for the Artifact file.

@staticfloat believes these lookups come from

JLLWrappers.jl/src/wrapper_generators.jl

Lines 13 to 17 in 79226fa

	$(Expr(:macrocall, Symbol("@artifact_str"), __source__, src_name, :(host_platform)))
	else
	# We explicitly use `macrocall` here so that we can manually pass the `__source__`
	# argument, to avoid `@artifact_str` trying to lookup `Artifacts.toml` here.
	return $(Expr(:macrocall, Symbol("@artifact_str"), __source__, src_name))

(which is then calling https://github.com/JuliaLang/julia/blob/70bfa3fe09cd127f4a84bcb9b4709102477d8d30/stdlib/Artifacts/src/Artifacts.jl#L490-L509 at precompile time).

Instead of generating a call to @artifact_str, perhaps we can just look up the path from the artifact file which we know where it lives?