Missing cblas.dll in the Windows pypi wheel

[rozyczko]

Problem

diffpy.pdffit2 installed on windows (any Python) can't be run, since gsl-25.dll requires libcblas.dll to run.

1. create new python environment
2. pip install diffpy.pdffit2
3. run python -c "import diffpy.pdffit2"
4. observe import error

Looking at gsl-25.dll included in the wheel, we see dependency on libcblas.dll

Proposed solution

Add libcblas.dll (and any potential dependencies of it) to the wheel. This can be taken from the conda-forge distribution of libcblas

[sbillinge]

@Tieqiong this seems familiar, but please could you take a look?