fix warning about overflow if matiec is running on 64-bit platform,
but the generated C code will cross-compiled for 32-bit platform

For example:
./build/config.c:29:39: error: large integer implicitly truncated to unsigned type [-Werror=overflow]
unsigned long greatest_tick_count__ = 18446744073709551611UL; /*tick*/
^
compilation terminated due to -Wfatal-errors.
cc1: all warnings being treated as errors

Source: matiec
Section: devel
Priority: standard
Maintainer: edouard <edouard.tisserant@gmail.com>
Build-Depends: debhelper (>= 5), bison, flex
Standards-Version: 3.7.2

Package: matiec
Architecture: any
Depends: ${shlibs:Depends}, ${misc:Depends}
Description: The IEC to ANSI-C compiler
 Compiles ST/IL/SFC code into ANSI-C code