fix compilation error about missing braces

IEC_TIMESPEC has two fields tv_sec and tv_nsec.

Compilation error:
./build/POUS.c:600:45: error: missing braces around initializer [-Werror=missing-braces]
static const STEP temp_step = {{0, 0}, 0, {0, 0}};
^
compilation terminated due to -Wfatal-errors.

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Source: matiec

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Section: devel

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Priority: standard

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Maintainer: edouard <edouard.tisserant@gmail.com>

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Build-Depends: debhelper (>= 5), bison, flex

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Standards-Version: 3.7.2

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Package: matiec

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Architecture: any

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Depends: ${shlibs:Depends}, ${misc:Depends}

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Description: The IEC to ANSI-C compiler

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 Compiles ST/IL/SFC code into ANSI-C code