Remove even more dead Fortran configury.

This configure option was only relevant when we were generating TKR
"use mpi" interfaces for MPI subroutines with choice buffers.  Now
that we aren't, the only interface that needs to accept a choice
buffer is MPI_SIZEOF (which we have to provide).  

And since there's now only several dozen interfaces in the "mpi" TKR
module, there's no reason to not generate ''all'' possible array rank
values (when there were thousands of interfaces, generating 4-vs-7
array ranks per interface per type was a big deal).  The default used
to be 4; now we can just hard-code it to 7, the max possible value for
Fortran 2003 (I think the max was raised ?to 11? in F2008, but let's
not go there for now).

cmr=v1.7.5:reviewer=dgoodell:subject=Remove even more dead Fortran configury
Fix typos in Fortran configury: ensure to call the right m4 macros!

Refs #4093