precompile find_artifact_dir

[IanButterworth]

Seems to be beneficial

Before

julia> @time_imports using LLVMExtra_jll
      0.4 ms  LazyArtifacts
     10.7 ms  Preferences
      1.0 ms  JLLWrappers
               ┌ 35.1 ms LLVMExtra_jll.__init__() 11.12% compilation time
     82.6 ms  LLVMExtra_jll 59.69% compilation time

This PR

julia> @time_imports using LLVMExtra_jll
      0.5 ms  LazyArtifacts
     10.9 ms  Preferences
      0.7 ms  JLLWrappers
               ┌ 6.5 ms LLVMExtra_jll.__init__() 55.44% compilation time
     50.0 ms  LLVMExtra_jll 90.38% compilation time

[codecov]

Codecov Report

Merging #53 (7c3d1e1) into master (5b14792) will increase coverage by 2.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   54.05%   56.10%   +2.05%     
==========================================
  Files           7        7              
  Lines         222      221       -1     
==========================================
+ Hits          120      124       +4     
+ Misses        102       97       -5     

Impacted Files	Coverage Δ
src/wrapper_generators.jl	80.76% <100.00%> (+17.80%)	⬆️

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