Add more robust detection of case insensitive string compare

Jan Breuer

2013-10-22 fea06605af79832c6abe7a8e6a24c142987994d6

 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"},
};