Fix memoryview assignment from const view to const view.
Fix memoryview assignment from const view to const view.

da-woods/cython,da-woods/cython,cython/cython,da-woods/cython,cython/cython,scoder/cython,cython/cython,scoder/cython,scoder/cython,cython/cython,da-woods/cython,scoder/cython