Created gcobol-tests bugsuite test number 12: SIMPLE HEX STRING

The bugsuite test number 12 demonstrates the following problem:

An attempt to declare a variable

 10 as-value pic x(4) value X'01020304'

results in, at parser_symbol_add() time, of a new_var->data.initial string of

 "16909060.0"

It might be of interest to note that the hex value 0x01020304 has a decimal value of 16969060