i386 build is broken, missing defines for 64-bit file operations in source

ldmtool fails to scan disk for ldm data on 32-bit system

open("/dev/sda", O_RDONLY) = 3
ioctl(3, BLKSSZGET, [512]) = 0
pread64(3, "3\300\216\320\274\0|\373P\7P\37\374\276\33|\277\33\6PW\271\345\1\363\244\313\275\276\7\261\4"..., 512, 0) = 512
pread64(3, "PRIVHEAD\0\0=\4\0\2\0\v\1\3231h\235\33\376\266\0\0\0\0\0\0\0051"..., 391, 3072) = 391
fstat64(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 0), ...}) = 0
ioctl(3, BLKGETSIZE64, [320072933376]) = 0
mmap2(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6eb0000
pread64(3, 0xb6eb0008, 1048576, 18446744071658889216) = -1 EINVAL (Invalid argument)

syscall pread64 is expecting 64bit offset here, but on 32-bit system only 4 bytes are pushed on stack so it grabs garbage for missing 32 bits.
There should be #define _FILE_OFFSET_BITS 64 set somewhere in the code.

I am not very familiar with ubuntu's development to submit correct patch on my own :)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ldmtool 0.2.3-3
ProcVersionSignature: Ubuntu 4.4.0-93.116-generic 4.4.79
Uname: Linux 4.4.0-93-generic i686
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: i386
CurrentDesktop: Unity
Date: Wed Sep 20 00:55:24 2017
InstallationDate: Installed on 2017-09-16 (3 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release i386 (20170801)
SourcePackage: libldm
UpgradeStatus: No upgrade log present (probably fresh install)