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this attempts to fix a problem with thread safety, see #581 for more context
fixes #633 sass/sassc-ruby#133 sass/sassc-rails#122 sass/sassc-rails#58 #638 ...
there's a race condition between sassc_processor.rb and sassc_compressor.rb, both calls SassC::Engine with different functions.
WIP because it this depends on sass/sassc-ruby#162
1/ no more segfaults even with concurrency enabled
2/ sass gem has the same problem, but the gem is deprecated, so it can't be fixed
3/ https://github.com/sass/sassc-rails will require a similar change