py-cipheycore: Fix python3 configuration

[harens]

Description

Apologies for all these bug fixes for cipheycore. Loads of Ciphey users who use macOS have issues with cipheycore (e.g. Ciphey/Ciphey#256 Ciphey/Ciphey#362), which is why I think it's so important to have a working MacPorts portfile. Hopefully, this should be the last bug fix before adding ciphey.

cipheycore builds fine if only it's equivalent python version is active (i.e. py38-cipheycore builds fine if only python38 is active). This is fine for the buildbots, but not if the user has to build from source and has different python versions active. If the wrong python version is found, a segmentation fault occurs at runtime. This sort of issue is very similar to https://trac.macports.org/ticket/59946, and a temporary fix before this PR is merged would be to use trace mode.

The reason why this happens is explained here Ciphey/Ciphey#238 (comment).

This bug fix manually sets the build dependency python to be used during the configure stage. It sets -DCIPHEY_CORE_PYTHON to the folder containing the python headers (see https://github.com/Ciphey/CipheyCore#linuxosxother-unices).

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 11.1 20C69
xcode-select version 2384.

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL?
• checked your Portfile with port lint?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?

[harens]

Thank you very much @cjones051073.