Build tag is not correctly added to WHEEL metadata file

[tttapa]

Describe the bug
The build tag (distlib.wheel.Wheel.buildver) is not added to the WHEEL metadata file as prescribed by PEP 491.

To Reproduce
Use distlib.wheel to generate a wheel package with buildver='1foo'. Observe that the WHEEL metadata file does not contain a Build: 1foo line. Alternatively, Ctrl+F for buildver in distlib/wheel.py.

Expected behavior
The WHEEL metadata file should contain a Build: 1foo line if buildver='1foo'.

Environment

• OS: any
• distlib: 0.3.9

[vsajip]

Thanks for the report. I'm away at the moment but will look into this when I return, in mid-December.