grib_ieee64_to_long / grib_long_to_ieee64 function needs the system
sizeof(long) == sizeof(double). So on windows system grib_sh_ieee64 test is
disabled.
Similarly, disable this test on linux 32 bit system.
The proposal patch "disables" the following test on linux 32 bit:
# 128 - eccodes_t_grib_sh_ieee64