Fix Numpy 1.20.0 by initializing PyArray_Descr portably

Description

According to the Numpy documentation:

To ensure compatibility:

• Never declare a non-pointer instance of the struct
• Never perform pointer arithmatic
• Never use sizof(PyArray_Descr)

The SWIG bindings broke the first of these rules. Improper order of initialization led to a null pointer that was causing a segfault.

Fixes #414 (closed). (We shall see!)

API Changes and Justification

Backwards Compatible Changes

• This change introduces no API changes
• This change adds new API calls

Backwards Incompatible Changes

• This change modifies an existing API
• This change removes an existing API

If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.

Review Status

N/A

lal/conda/meta.yaml.in.in

@@ -122,7 +122,6 @@ outputs:
         - lscsoft-glue >=@MIN_GLUE_VERSION@
         - mkl  # [fft_impl == "mkl"]
         - {{ pin_compatible('numpy') }}
-        - numpy <1.20.0a0
         - python
         - python-dateutil
         - scipy