install/52094: amd64 iso is only bootable in efi mode on legacy Mac

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>Number:         52094
>Category:       install
>Synopsis:       amd64 iso is only bootable in efi mode on legacy Mac
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 19 21:10:00 +0000 2017
>Originator:     Sevan Janiyan
>Release:        7.99.66
>Organization:
>Environment:
>Description:
The amd64 is bootable in EFI mode or by conventional means (is El Torito the correct term?).
On a legacy mac, the EFI boot manager built into the system firmware (accessed by holding option) will only present the EFI boot mode.

On a more recent mac, you'er present with two boot options for a medium.
>How-To-Repeat:
Boot the amd64 iso on a intel Mac, in this case, a 2007 17" MacBook Pro.
>Fix: