OpenMPI: added v4.0.4 (#17202)

Bug fix release:

4.0.4 -- June, 2020
-----------------------
- Fix a memory patcher issue intercepting shmat and shmdt.  This was
  observed on RHEL 8.x ppc64le (see README for more info).
- Fix an illegal access issue caught using gcc's address sanitizer.
  Thanks to  Georg Geiser for reporting.
- Add checks to avoid conflicts with a libevent library shipped with LSF.
- Switch to linking against libevent_core rather than libevent, if present.
- Add improved support for UCX 1.9 and later.
- Fix an ABI compatibility issue with the Fortran 2008 bindings.
  Thanks to Alastair McKinstry for reporting.
- Fix an issue with rpath of /usr/lib64 when building OMPI on
  systems with Lustre.  Thanks to David Shrader for reporting.
- Fix a memory leak occurring with certain MPI RMA operations.
- Fix an issue with ORTE's mapping of MPI processes to resources.
  Thanks to Alex Margolin for reporting and providing a fix.
- Correct a problem with incorrect error codes being returned
  by OMPI MPI_T functions.
- Fix an issue with debugger tools not being able to attach
  to mpirun more than once.  Thanks to Gregory Lee for reporting.
- Fix an issue with the Fortran compiler wrappers when using
  NAG compilers.  Thanks to Peter Brady for reporting.
- Fix an issue with the ORTE ssh based process launcher at scale.
  Thanks to Benjamín Hernández for reporting.
- Address an issue when using shared MPI I/O operations.  OMPIO will
  now successfully return from the file open statement but will
  raise an error if the file system does not supported shared I/O
  operations.  Thanks to Romain Hild for reporting.
- Fix an issue with MPI_WIN_DETACH.  Thanks to Thomas Naughton for reporting.

Signed-off-by: Howard Pritchard <howardp@lanl.gov>

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