BUG: Force `npymath to respect npy_longdouble`
#20465
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…t `npy_longdouble` (numpy#20360) In some certain cases mostly workarounds, there's a necessity to define `npy_longdouble` as `double` even if that was against the compiler implementation(sizeof(long double) != sizeof(double)). Therefore, avoid `long double`, use `npy_longdouble` instead, and when it comes to standard math functions make sure of using the double version when `NPY_SIZEOF_LONGDOUBLE` == `NPY_SIZEOF_DOUBLE`.
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Backport of #20360.
Revert from long double changes and force
npymathto respectnpy_longdouble.In some certain cases mostly workarounds, there's a necessity to define
npy_longdoubleas
doubleeven if that was against the compiler implementation(sizeof(long double) != sizeof(double)).Therefore, avoid
long double, usenpy_longdoubleinstead,and when it comes to standard math functions make sure of using
the double version when
NPY_SIZEOF_LONGDOUBLE==NPY_SIZEOF_DOUBLE.Closes #20348