gmio_stla_read() and gmio_stla_write() now checks LC_NUMERIC is
either "C" or "POSIX", if not then GMIO_ERROR_BAD_LC_NUMERIC is returned.
This option is controlled with:
* gmio_stl_read_options.stla_dont_check_lc_numeric
* gmio_write_read_options.stla_dont_check_lc_numeric