Makefile broken on non-macOS

[dkasak]

Running make results in

find .stack-work/install/x86_64-osx -name pandoc-sidenote -type f \
     -exec zip -j pandoc-sidenote-0.23.0.zip '{}' ';'
find: ‘.stack-work/install/x86_64-osx’: No such file or directory
make: *** [Makefile:10: pandoc-sidenote-0.23.0.zip] Error 1

This was introduced in 6b01731 which says it aims to fix the Makefile on macOS. But it seems to break it on all other platforms?

[dkasak]

Maybe this is actually just a private Makefile for the release manager and it's not intended to be used generally? In which case it would probably make more sense if it was in a separate directory rather than at top-level.