Support newlib C library configurations without tm_gmtoff field #2600
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Newlib C library has a configuration option to add tm_gmtoff field to the
tm
structure.Not all the platforms supported by newlib enable this option, and spdlog doesn't compile on such platforms due to missing
tm_gmtoff
field.This PR fixes this by checking for
__NEWLIB__
and__TM_GMTOFF
and enablingcalculate_gmt_offset
.