lang/python314: get port ready to ship

claim maintainership on the new port - not doing that with the
previous commit by wen@ to have a clear distinction who contributed
what.

• require archivers/zstd since it's part of the Python standard library: https://docs.python.org/3.14/whatsnew/3.14.html#whatsnew314-zstandard

• refresh Makefile.pre.in patch

• skip test_gdb without WITH_DEBUG
  
  test_gdb has test_pretty_print, which requires debug symbols. Skip it if WITH_DEBUG is not defined.

• drop --with-system-ffi configure option, which is no longer supported and its behaviour is now the default

• move sqlite3 extension back into port because the separate port fails to build (mark the external python:-3.13)

PR: 282176