Sometimes RuboCop is unable to load jaro_winkler

[wingrunr21]

Originally detailed in #451

It appears that in some circumstances jaro_winkler's native extensions are not being detected properly and so cannot be loaded by the RuboCop spawn

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Changed file
Lint: executing rubocop -s /Users/peter/XXXXXX/test/models/xxxxxx.rb -f json -R...
Lint: Received invalid JSON from rubocop:

Ignoring jaro_winkler-1.5.2 because its extensions are not built.  Try: gem pristine jaro_winkler --version 1.5.2
Ignoring jaro_winkler-1.5.1 because its extensions are not built.  Try: gem pristine jaro_winkler --version 1.5.1
<more lines with more gems here>

/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:120:in `require': cannot load such file -- jaro_winkler (LoadError)
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:120:in `require'
	from /Users/peter/.rvm/gems/ruby-2.5.3@ptcshell/gems/rubocop-0.65.0/lib/rubocop/string_util.rb:3:in `<top (required)>'
	from /Users/peter/.rvm/gems/ruby-2.5.3@ptcshell/gems/rubocop-0.65.0/lib/rubocop.rb:21:in `require_relative'
	from /Users/peter/.rvm/gems/ruby-2.5.3@ptcshell/gems/rubocop-0.65.0/lib/rubocop.rb:21:in `<top (required)>'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:68:in `require'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:68:in `require'
	from /Users/peter/.rvm/gems/ruby-2.5.3@ptcshell/gems/rubocop-0.65.0/exe/rubocop:6:in `<top (required)>'
	from /Users/peter/.rvm/gems/ruby-2.5.3@ptcshell/bin/rubocop:26:in `load'
	from /Users/peter/.rvm/gems/ruby-2.5.3@ptcshell/bin/rubocop:26:in `<main>'
	from /Users/peter/.rvm/gems/ruby-2.5.3@ptcshell/bin/ruby_executable_hooks:24:in `eval'
	from /Users/peter/.rvm/gems/ruby-2.5.3@ptcshell/bin/ruby_executable_hooks:24:in `<main>'

[wingrunr21]

This appears to be due to a bug in the environment detection. For some reason gem is being executed under the correct version of Ruby but the actual version of Ruby running is whatever is default on the system. Also seems to be happening independently of version manager or bundler version.

[wingrunr21]

Resolved via b5584d9

spawn-rx was attempting to crawl PATH and find the command to run. I believe this caused oddities with native extensions.