- Rediff openucx-s390x-support.patch as p1 to be in line with
  potential git-generated patches.

- Switch to version 1.2.1 (Fate#324050)
  Previous 1.3+ version was based on a development branch.
  Supported platforms
    - Shared memory: KNEM, CMA, XPMEM, SYSV, Posix
    - VERBs over InfiniBand and RoCE.
      VERBS over other RDMA interconnects (iWarp, OmniPath, etc.) is available
      for community evaluation and has not been tested in context of this release
    - Cray Gemini and Aries
    - Architectures: x86_64, ARMv8 (64bit), Power64
  Features:
    - Added support for InfiniBand DC and UD transports, including accelerated verbs for Mellanox devices
    - Full support for PGAS/SHMEM interfaces, blocking and non-blocking APIs
    - Support for MPI tag matching, both in software and offload mode
    - Zero copy protocols and rendezvous, registration cache
    - Handling transport errors
    - Flow control for DC/RC
    - Dataypes support: contiguous, IOV, generic
    - Multi-threading support
    - Support for ARMv8 64bit architecture
    - A new API for efficient memory polling
    - Support for malloc-hooks and memory registration caching

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