[syslinux] patch for UEFI PXE booting bugs

[Da Shi Cao]

PXE booting in UEFI mode of HP Proliant Gen9 will fail if the nic port
used is not the first one enumerated.
Based on syslinux 6.03, several modifications have to be made in the
EFI supporting codes.
1. The function "net_parse_dhcp". Instead of using the first handle
that returns EFI_SUCCESS, a check on the DhcpAckReceived is made. The
index and the total number handles are saved in global variables.
2. Function "efi_create_binding". Instead of using the first handle
that returns EFI_SUCCESS, a best guess on the working handle is made
and used directly.
3. Functions "core_udp_connect" and "core_udp_sendto". The ip address
in the global variable IPInfo is used instead of the default address!

Please look at the attached patch file for details.
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