I have started working on this (partial patch attached), but I am unsure how to handle cases where the docstring definition utilizes a macro. For example:

PyDoc_STRVAR(strftime_doc,
"strftime(format[, tuple]) -> string\n\
\n\
Convert a time tuple to a string according to a format specification.\n\
See the library reference manual for formatting codes. When the time tuple\n\
is not present, current time as returned by localtime() is used.\n\
\n" STRFTIME_FORMAT_CODES);

I don't think STRFTIME_FORMAT_CODES will be expanded if I put it into the [clinic] comment section. 

Should I include the contents verbatim? Or do not convert these functions to argument clinic?