fix C compilation warning from gcc about /* inside of comment section.


./beremiz/iec_std_lib.h:240:1: error: "/*" within comment [-Werror=comment]
/*
^
compilation terminated due to -Wfatal-errors.
cc1: all warnings being treated as errors

AM_CXXFLAGS = -g -Wall -Wpointer-arith -Wwrite-strings -Wno-unused