fix regression introduced by changeset: 1431:28e9d479aa65 [Use '-p' command line option when running matiec (iec2c)]

Variable matiec_flags in c_ext.py and PythonFileCTNMixin.py is not
used for flags for matiec (IEC to C compiler) actually, but it's used
to compile C-code generated for extensions using normal C-compiler,
like gcc.

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from ..toolchain_gcc import toolchain_gcc

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class Linux_target(toolchain_gcc):

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    dlopen_prefix = "./"

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    extension = ".so"

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    def getBuilderCFLAGS(self):

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        return toolchain_gcc.getBuilderCFLAGS(self) + ["-fPIC"]

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    def getBuilderLDFLAGS(self):

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        return toolchain_gcc.getBuilderLDFLAGS(self) + ["-shared", "-lrt"]