It seems like it might be easiest to build the arm64-macos asset on
macos. Prepare to do that.

It produced an error:

    shasum: standard input: no properly formatted SHA checksum lines found

`Security/SecRandom.h` was still not found when cross-compiling for
arm64 macos, even when building on macos:

    /Users/runner/.cache/nim/configlet_r/@m..@snimdir@slib@sstd@ssysrand.nim.c:9:10: fatal error: 'Security/SecRandom.h' file not found
             ^~~~~~~~~~~~~~~~~~~~~~
    nimble.nim(229)          buildFromDir
    1 error generated.

    Error: execution of an external compiler program 'zigcc -c -w -ferror-limit=3 -pthread -target aarch64-macos-none -Os   -I/Users/runner/work/configlet/configlet/nimdir/lib -I/Users/runner/work/configlet/configlet/src -o /Users/runner/.cache/nim/configlet_r/@m..@snimdir@slib@sstd@ssysrand.nim.c.o /Users/runner/.cache/nim/configlet_r/@m..@snimdir@slib@sstd@ssysrand.nim.c' failed with exit code: 1
    Error:  Build failed for the package: configlet

Some `clang --help` output:

  -F <value>              Add directory to framework include search path
  -I <dir>                Add directory to the end of the list of include search paths
  -iframeworkwithsysroot <directory>
                          Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot
  -iframework <value>     Add directory to SYSTEM framework search path

Building with the previous commit produced a link-time error:

    CC: configlet.nim
    Hint:  [Link]
    warning(link): framework not found for '-framework Security'
    warning(link): Framework search paths:
    error(link): undefined reference to symbol '_SecRandomCopyBytes'
    error(link):   first referenced in '/Users/runner/.cache/nim/configlet_r/@m..@snimdir@slib@sstd@ssysrand.nim.c.o'
    error: UndefinedSymbolReference

I think this won't work.

This reverts commit d0e67f6.

It produced the error:

    error: LTO is not yet supported with the Mach-O object format. More details: ziglang/zig#8680