Use bootclasspath in SCALA autoconf

[quantum5]

No description provided.

[codecov-io]

Codecov Report

Merging #550 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #550      +/-   ##
==========================================
+ Coverage   73.31%   73.36%   +0.05%     
==========================================
  Files         127      127              
  Lines        3950     3950              
==========================================
+ Hits         2896     2898       +2     
+ Misses       1054     1052       -2

Impacted Files	Coverage Δ
dmoj/executors/SCALA.py	95.74% <100%> (ø)	⬆️
dmoj/cptbox/tracer.py	84.65% <0%> (+0.49%)	⬆️
dmoj/executors/base_executor.py	77.89% <0%> (+0.52%)	⬆️

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