fastputmask is deprecated in NumPy 1.19

[alexhsamuel]

With NumPy 1.19 (but perhaps not with later versions??)

$ py -W error::DeprecationWarning
Traceback (most recent call last):
  File "/home/alex/.pythonstartup", line 34, in <module>
    exec(_file.read())
  File "<string>", line 3, in <module>
  File "/home/alex/dev/ora/python/ora/__init__.py", line 7, in <module>
    from   .calendar import (
  File "/home/alex/dev/ora/python/ora/calendar.py", line 5, in <module>
    from   .ext import Date
DeprecationWarning: The ->f->fastputmask member of custom dtypes is ignored; setting it may be an error in the future.
The custom dtype you are using must be revised, but results will not be affected.