Chromeless fix (#192)

[guybedford]

This fixes the Chromeless build using a very simple boolean inlining approach.

We have to be quite careful with this not to inline the wrong booleans (say there was a process.env check that evaluates to false in the build but will evaluate to true in production). So this is just restricted to the specific trigger cases around assets.

[codecov-io]

Codecov Report

Merging #221 into master will increase coverage by 0.4%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #221     +/-   ##
=======================================
+ Coverage   69.59%    70%   +0.4%     
=======================================
  Files          13     13             
  Lines         661    670      +9     
=======================================
+ Hits          460    469      +9     
  Misses        201    201

Impacted Files	Coverage Δ
src/loaders/relocate-loader.js	92.92% <100%> (+0.2%)	⬆️

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