MAINT: handle NPY_ALLOW_THREADS and related build option better - #26036
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The option to disable threading in CPython was removed a long time ago (see cpython#3385); `WITH_THREAD` was kept defined for backwards compatibility, but can never change - so best to remove checking for it. The docs still mentioned the old `NPY_NOSMP` environment variable, support for which was removed with the move to Meson. Instead, there is a `disable-threading` build option, so document that.
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Backport of #26016.
The option to disable threading in CPython was removed a long time ago (see python/cpython#3385);
WITH_THREADwas kept defined for backwards compatibility, but can never change - so best to remove checking for it.The docs still mentioned the old
NPY_NOSMPenvironment variable, support for which was removed with the move to Meson. Instead, there is adisable-threadingbuild option, so document that.