make kwarg slurping the same across Julia target methods

[wsphillips]

fixes #697

[wsphillips]

I kept it to just the julia target meethods. If you want to make it across all methods of _build_function let me know

[codecov-commenter]

Codecov Report

Merging #698 (5e73412) into master (7eac913) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #698   +/-   ##
=======================================
  Coverage   76.55%   76.55%           
=======================================
  Files          23       23           
  Lines        2721     2721           
=======================================
  Hits         2083     2083           
  Misses        638      638           

Impacted Files	Coverage Δ
src/build_function.jl	74.69% <ø> (ø)

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