Well, I have asked another person to test this iso on a Mac for me.
Result: on an iMac 2007,
http://82.193.153.141/minimal-grub2-repacked-v2.iso just shows the blank
screen. On Mac Pro 2012, it shows three menu entries, and only two of
them work. Please see this Google+ album for photos:
https://goo.gl/photos/GRS5khE8r7Xgat9L8
Now testing other ISOs.
OK, the 2007 Mac does not recognize any of the isos below.
The 2012 mac shows two options, "Windows" and "EFI Boot", in this order,
on these ISOs:
http://82.193.153.141/minimal.iso
http://82.193.153.141/minimal-hybrid.iso
The 2012 Mac shows two working "EFI Boot" options on this ISO:
http://82.193.153.141/minimal-grub2-repacked-fdisked.iso