Add recipe for squadgen

[xylar]

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[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/squadgen) and found it was in an excellent condition.

I do have some suggestions for making it better though...

For recipes/squadgen:

• License is not an SPDX identifier (or a custom LicenseRef) nor an SPDX license expression.

Documentation on acceptable licenses can be found here.

[xylar]

Note: this library includes the source for the legacy NetCDF C++ library, but it doesn't create a library of its own, just an executable. The license file has been included.

[xylar]

@conda-forge/help-c-cpp, ready for review!

[xylar]

@ocefpaf, another one that you might be willing to have a look at? Also, if you understand what I've done that is causing libpng to be linked statically rather than dynamically, let me know. I'm not super expert in CMake yet...

[xhochy]

Maybe try BUILD_SHARED_LIBS=1

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/squadgen) and found it was in an excellent condition.

[xylar]

@xhochy, thanks again for your help.

I finally solved the mystery. squadgen was including png.h but then not actually using it for anything (so I have patched to remove the unneeded include). Instead, it builds LodePNG internally and uses that. I have added the license for this as well.

[xylar]

@xhochy, the tests are now passing and there is no longer any overdependence. Would you be able to give this another look? Thank you!

[ocefpaf]

Thanks @xhochy for the review and @xylar for the package!

[xylar]

Thanks so much @ocefpaf and @xhochy!