[issue20151] Convert the binascii module to use Argument Clinic

Changes by Serhiy Storchaka : -- dependencies: +inspect.signature fails on some functions which use Argument Clinic ___ Python tracker ___ __

[issue20151] Convert the binascii module to use Argument Clinic

New submission from Serhiy Storchaka: Here is a patch which converts the binascii module to use Argument Clinic. 14 functions are converted. There is one known issue. Pydoc doesn't show signature and docstring for several functions: a2b_qp, b2a_qp, crc32. -- components: Extension Modu