Adds ghcjs and Asterius as cross compilers#106

Merged

angerman merged 6 commits intoinput-output-hk:masterfrom

hamishmack:wip/ghcjs-cross

May 16, 2019

Commits on Apr 4, 2019

PoC for running ghcjs as a cross compiler
hamishmack
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Commits on Apr 5, 2019

Commits on Apr 6, 2019

Commits on May 16, 2019

Merge branch 'master' into wip/ghcjs-cross
angerman
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