Remove upx stuff from Dockerfile.

linux/Dockerfile

@@ -5,10 +5,7 @@ RUN apk add alpine-sdk git ca-certificates ghc gmp-dev zlib-dev bash dpkg fakero
 # GRAB A RECENT BINARY OF STACK
 # Note that 1.6.5 is the last one with a static binary...
 RUN curl -L https://github.com/commercialhaskell/stack/releases/download/v1.6.5/stack-1.6.5-linux-x86_64-static.tar.gz | tar xz --wildcards --strip-components=1 -C /usr/local/bin '*/stack'
-# COMPRESS WITH UPX
-ADD https://github.com/lalyos/docker-upx/releases/download/v3.91/upx /usr/local/bin/upx
 ENV PATH="/usr/local/bin:${PATH}"
-RUN chmod 755 /usr/local/bin/upx
 RUN ulimit -n 4096
 RUN stack config set system-ghc --global true
 RUN stack setup --resolver lts-12