`np.MAXDIMS` was removed from the public API and
no replacement is given in the migration docs.

In numpy <= 1.26, the value of `np.MAXDIMS` was 32.
This was often used as a flag to mean `axis=None`.

In numpy >= 2.0, the maximum number of dims of an
array has been increased to 64; simultaneously, a
constant `NPY_RAVEL_AXIS` was added to the C-API to
indicate that `axis=None`.

In most cases, the use of `np.MAXDIMS` to
check for `axis=None` can be replaced by the
new constant `NPY_RAVEL_AXIS`.

To make this constant accessible when using numpy <= 1.26,
I added a function to insert `npy_2_compat.h` into the support
code for the affected ops.