Log Message:
Update py-gmpy to 1.15.
Based on PR 46507 by Wen Heping.
* let to register egg-info.
* all files in distfile are not DOS style EOL oter than Windows related files,
  so remove extract option for ZIP.

GMPY 1.15 is a bug fix release. The following bugs were fixed:
* Reference counting leak in divmod(x,0).
* Fatal crash in remove(x,1).
* Discontinue use of custom memory allocator. (Fixes compatibility with Sage.)
* Allow up to base-62 integer conversion.