v5.0.x: fortran: fix ompi string c2f where len(fstr) < len(cstr) #13382
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Thanks to Ben Menadue @benmenadue for pointing out that ompi_fortran_string_c2f() missed a case to properly terminate the resulting Fortran string when copying from a longer C source string.
(cherry picked from commit 694e78a)
This is the v5.0.x PR corresponding to main PR #13381 and #13387
Fixes #13375