databases/py-peewee: Update to 3.1.2

Maintainer's timeout expired: matthias@petermann-it.de

Port changes:

• Changed to DISTVERSION
• Removed option DOCS (not needed)
• Added USES=localbase sqlite
• Added USE_PYTHON=cython concurrent
• Added stripping
• Removed MYSQL_VARS

PR: 219175
Approved by: tcberner (mentor, implicit)