Fix discarded-qualifiers warnings

Author: hpkfft

Modules/_testbuffer.c

@@ -165,7 +165,7 @@ ndbuf_free(ndbuf_t *ndbuf)
     Py_buffer *base = &ndbuf->base;
 
     PyMem_XFree(ndbuf->data);
-    PyMem_XFree(base->format);
+    PyMem_XFree((void*)base->format);
     PyMem_XFree(base->shape);
     PyMem_XFree(base->strides);
     PyMem_XFree(base->suboffsets);
@@ -666,7 +666,7 @@ ndarray_as_list(NDArrayObject *nd)
     Py_ssize_t simple_strides[1];
     char *item = NULL;
     PyObject *format;
-    char *fmt = base->format;
+    const char *fmt = base->format;
 
     base = &nd->head->base;
 

Objects/memoryobject.c

@@ -123,7 +123,7 @@ mbuf_dealloc(PyObject *_self)
     assert(self->exports == 0);
     mbuf_release(self);
     if (self->flags&_Py_MANAGED_BUFFER_FREE_FORMAT)
-        PyMem_Free(self->master.format);
+        PyMem_Free((void*)self->master.format);
     PyObject_GC_Del(self);
 }