DEP: Deprecate changing shape of non-C-contiguous array via descr.

This deprecates assignment of a new descriptor to the dtype attribute of
a non-C-contiguous array if it result in changing the shape. This
effectively bars viewing a multidimensional Fortran array using a dtype
that changes the element size along the first axis.

The reason for the deprecation is that, when relaxed strides checking is
enabled, arrays that are both C and Fortran contiguous are always
treated as C contiguous which breaks some code that depended the two
being mutually exclusive for arrays of dimension > 1. The intent of this
deprecation is to prepare the way to always enable relaxed stride
checking.

Example
-------

```
In [1]: import warnings

In [2]: warnings.simplefilter('always')

In [3]: a = ones((2, 1), order='F').view(complex)
/home/charris/.local/bin/ipython:1: DeprecationWarning: Changing the shape
of non-C contiguous array by descriptor assignment is deprecated. To
maintain the Fortran contiguity of a multidimensional Fortran array, use
'a.T.view(...).T' instead
```

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