Mktemp not working properly on macOS

OS version: 10.14.6 mktemp: version 8.31 from GNU coreutils (installed with brew)

When trying to install ghcup the command ghcup --cache install throws an error stating there are "X's" missing in the template.

I just changed mktemp -d -t ghcup to mktemp -d -t ghcup.XXXXXXXX when mktemp_mydistro = "darwin" and ran the install commands by hand and everything worked perfectly.

When using the native mktemp from macOS located in /usr/bin it works as expected, and with the modified command the folder created is named something like: "ghcup.XXXXXXXX.uGWKmA7c"

Maybe the script could be modified to enable cross compatibility both with native mktemp and the one from coreutils.

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