Recently Wobbler found that if you package a Mac app .zip from Windows it
doesn't run on a Mac, and today I see Spendidland has [hit the same
problem](https://splendidland.itch.io/franken). Distributing from Linux works.
Although I don't currently have access to a Mac to test, I assume the problem
is that the unzipper built into Finder (no idea in which Mac OS version this
started) no longer indiscriminately sets the +x bit on all files from a .zip
created on Windows. zip files record which OS each file in the archive is from,
with OS-specific metadata. Windows files don't have +x bits, so the zip format
has no way to set them as executable.
Maybe we should disable the Distribute for Mac options until this is fixed?
Spendidland resorted to telling Mac users to set the +x in the terminal.
I already wrote code to create .gz files but I don't want to expand it to .zip
because it uses LodePNG's DEFLATE implementation, which compresses poorly in
comparison to standard Info-ZIP. I think the easiest solution is to patch and
compile our own zip.exe.
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