fix initialization problem for Inf, NaN, and NA values (bug #41667) * lo-cieee.c: Move function definitions to lo-ieee.cc and delete file. * liboctave/util/module.mk (UTIL_C_SRC): Remove lo-cieee.c from the list. * lo-ieee.h (octave_Inf, octave_Float_Inf, octave_NA, octave_Float_NA, octave_NaN, octave_Float_NaN): Define as macros that expand to function calls instead of using global variables. * lo-ieee.cc (lo_inf, lo_nan, lo_na, lo_float_inf, lo_float_nan, lo_float_na): New static variables. (octave_ieee_init): Set internal static variables here. (__lo_ieee_isnan, __lo_ieee_finite, __lo_ieee_isinf, __lo_ieee_signbit, __lo_ieee_float_isnan, __lo_ieee_float_finite, __lo_ieee_float_isinf, __lo_ieee_float_signbit): Use std:: functions if possible, otherwise rely on gnulib. (lo_ieee_inf_value, lo_ieee_na_value, lo_ieee_nan_value, lo_ieee_float_inf_value, lo_ieee_float_na_value, lo_ieee_float_nan_value): Call init function.