[syslinux] Latest firmware branch failing to compile with gnu-efi-3.0t

[Adam Baxter]

The last version that builds for me is:

commit 37d43cf9dd5dd2d2cef1e86aa651097473fd0b48
Merge: bf20364 a107cb3
Author: Matt Fleming <matt.fleming at intel.com>
Date:   Wed Mar 20 17:14:21 2013 +0000

    Merge tag 'syslinux-5.10-pre2' into for-hpa/elflink/firmware