Propagate sysimage_build_args to run_precompilation_script

[IanButterworth]

Allows julia args to be set during the precompilation phase

[codecov[bot]]

Codecov Report

Merging #569 (077c65a) into master (3c928ab) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #569   +/-   ##
=======================================
  Coverage   83.22%   83.22%           
=======================================
  Files           2        2           
  Lines         459      459           
=======================================
  Hits          382      382           
  Misses         77       77           

Impacted Files	Coverage Δ
src/PackageCompiler.jl	81.90% <100.00%> (ø)

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[KristofferC]

Also, perhaps update the docstrings that mention this?