MacOS: Install ispc
by downloading **versioned** release from GitHub
#31
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brew
keeps horribly breaking, and abrew install ispc
after abrew upgrade
takes an insulting 13 minutes to also update all kinds of unrelated "formulae" that are irrelevant to the request to simply upgradeispc
(and direct dependencies). And it doesn't even allow us to pin the version to match the Linux and Windows jobs.This is simply solved by mimicking the Linux/Windows install process, by downloading the latest versioned
ispc
binary from GitHub, extracting it, and passing the path toGITHUB_PATH
.Also clean up some inconsistencies in env var resolving, to all resolve them inside the shell script (via
$var
on UNIX and$env:var
on Windows) as${{ env.var }}
doesn't work in every context (i.e. to get toGITHUB_PATH
).