MAINT: handle NPY_ALLOW_THREADS
and related build option better
#26016
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The option to disable threading in CPython was removed a long time ago (see python/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 adisable-threading
build option, so document that.