Indent the existing ABI-breaking issue, and add a 2nd ABI-breaking
gfortran/mpi module issue.
Fixes #4192: Move r30455 to v1.7 branch (Add MPIEXEC_TIMEOUT environment variable to)

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r30455 [[BR]]
Add MPIEXEC_TIMEOUT environment variable to the man page.

cmr=v1.7.4:reviewer=rhc