Fix is_sorted_and_has_non_nan for byteswapped inputs.

[anntzer]

Closes #25995.

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[tacaswell]

The other option would be to make the template in _path.h byte order aware and/or extend the case statement.

However, given that we do not run into this in our own usage it is not worth the extra work to avoid a memory copy (despite I suspect the point of this helper function being to avoid memory copies).

[tacaswell]

There were two failures of a memory leak check with wxagg on ubuntu for py39 and py310. That might just be bad luck.

There has not been a new wxpython release so I do not suspect and upstream change. The reference counting looks correct here. I do not think there is any change in semantics between PyArray_CheckFromAny and PyArray_FromAny and if we always pass in native arrays there should be no difference in our tests.