Use CYTHON_FORMAT_SSIZE_T

Cython/Utility/Buffer.c

@@ -544,7 +544,7 @@ static int __Pyx_BufFmt_ProcessTypeChunk(__Pyx_BufFmt_Context* ctx) {
     offset = ctx->head->parent_offset + field->offset;
     if (ctx->fmt_offset != offset) {
       PyErr_Format(PyExc_ValueError,
-                   "Buffer dtype mismatch; next field is at offset %" PY_FORMAT_SIZE_T "d but %" PY_FORMAT_SIZE_T "d expected",
+                   "Buffer dtype mismatch; next field is at offset %" CYTHON_FORMAT_SSIZE_T "d but %" CYTHON_FORMAT_SSIZE_T "d expected",
                    (Py_ssize_t)ctx->fmt_offset, (Py_ssize_t)offset);
       return -1;
     }
@@ -809,7 +809,7 @@ static CYTHON_INLINE int __Pyx_GetBufferAndValidate(
   }
   if ((unsigned)buf->itemsize != dtype->size) {
     PyErr_Format(PyExc_ValueError,
-      "Item size of buffer (%" PY_FORMAT_SIZE_T "d byte%s) does not match size of '%s' (%" PY_FORMAT_SIZE_T "d byte%s)",
+      "Item size of buffer (%" CYTHON_FORMAT_SSIZE_T "d byte%s) does not match size of '%s' (%" CYTHON_FORMAT_SSIZE_T "d byte%s)",
       buf->itemsize, (buf->itemsize > 1) ? "s" : "",
       dtype->name, (Py_ssize_t)dtype->size, (dtype->size > 1) ? "s" : "");
     goto fail;