Update units.c - add support for INFinity

Jan Breuer

2014-01-29 64269a8e2628085fff25f732e81e9002c4891a16

 examples/common/scpi-def.cpp

@@ -172,5 +172,6 @@
    /* units */ scpi_units_def,
    /* special_numbers */ scpi_special_numbers_def,
    /* user_context */ NULL,
    /* idn */ {"MANUFACTURE", "INSTR2013", NULL, "01-02"},
};