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MPI_File_write_at(3) on Linux

The text 0eba5115f84b, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.

Write using explict offset

MPI_File_write_at(3) on Linux now