net-im/py-matrix-synapse: Update to 1.2.1

• Remove the EMAIL option and convert the dependencies of it as general runtime requirements.

While I'm here:

• Remove superfluous occurrences of "+=" from PLIST_SUB, SUB_LIST and the *_RUN_DEPENDS option helpers because there are no previous definitions of those variables.
• Remove workaround for devel/py-msgpack from the post-patch target that is no longer required.
• Do some cleanup and place variables to their intended locations.

Changelog:

• Note: The support for Python 2.7 was dropped with the 1.1.0 release!

https://github.com/matrix-org/synapse/releases/tag/v1.2.1

PR: 239013
Submitted by: Sascha Biberhofer <ports@skyforge.at> (maintainer)
MFH: 2019Q3
Security: 38d2df4d-b143-11e9-87e7-901b0e934d69