Implement patch for atsc_epg segfault on 64-bit systems

[taligentx]

Debian bug report 779520 contains a patch to resolve this segfault:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=779520

Before:

$ atsc_epg -f xxx000000:8VSB:49:52:3

tuning to xxx000000 Hz, please wait...
tuner locked.
system time: Tue Jul 24 13:15:27 2018
TS STT time: Tue Jul 24 13:15:43 2018
MGT table:
   0: type = 0x0000, PID = 0x1FFB, terrestrial VCT with current_next_indictor=1
   1: type = 0x0100, PID = 0x1D00, EIT 0
   2: type = 0x0101, PID = 0x1D01, EIT 1
   3: type = 0x0102, PID = 0x1D02, EIT 2
   4: type = 0x0103, PID = 0x1D03, EIT 3
   5: type = 0x0200, PID = 0x1E00, event ETT 0
   6: type = 0x0201, PID = 0x1E01, event ETT 1
   7: type = 0x0202, PID = 0x1E02, event ETT 2
   8: type = 0x0203, PID = 0x1E03, event ETT 3
receiving EIT .Segmentation fault (core dumped)

After:

$ atsc_epg -f xxx000000:8VSB:49:52:3

tuning to xxx000000 Hz, please wait...
tuner locked.
system time: Tue Jul 24 13:22:49 2018
TS STT time: Tue Jul 24 13:23:05 2018
MGT table:
   0: type = 0x0000, PID = 0x1FFB, terrestrial VCT with current_next_indictor=1
   1: type = 0x0100, PID = 0x1D00, EIT 0
   2: type = 0x0101, PID = 0x1D01, EIT 1
   3: type = 0x0102, PID = 0x1D02, EIT 2
   4: type = 0x0103, PID = 0x1D03, EIT 3
   5: type = 0x0200, PID = 0x1E00, event ETT 0
   6: type = 0x0201, PID = 0x1E01, event ETT 1
   7: type = 0x0202, PID = 0x1E02, event ETT 2
   8: type = 0x0203, PID = 0x1E03, event ETT 3
receiving EIT .............
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