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Date: Sat, 13 Sep 2014 19:21:43 +0400
From: Andrei Borzenkov <arvidjaar@gmail.com>
To: cjwatson@ubuntu.com, grub-devel@gnu.org
Subject: Re: Support grub-emu on x32 (ILP32 but with x86-64 instruction set)
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>     * configure.ac: Remove -m64 from checks for -mcmodel=large and
>     -mno-red-zone.  These are always either unnecessary (x86_64-emu) or
>     already in TARGET_CFLAGS at this point, and they produce incorrect
>     results when building for x32.

This was added to match what grub-core/Makefile.am actually uses. So
basically either Makefile.am needs fixing as well or your patch does
not fix the actual problem - meaning efiemu64.o will fail to compile.