Revert "Merge pull request #1 from jsquyres/tjcw-tjcw-fix-mpi-sizeof"

This reverts commit 3e6a196714c103e2c1aa8ccf28ff12eee6f8084c, reversing
changes made to 5de3d5dde688d1af4fc7c6c33636d5d808f40c0a.

 Signed-off-by: Joshua Hursey <jhursey@us.ibm.com>

README

@@ -373,12 +373,6 @@ Compiler Notes
     when Open MPI is built with a Fortran compiler that support the
     INTERFACE keyword and ISO_FORTRAN_ENV.
 
-    *** The Open MPI team has not tested to determine exactly which
-        version of the GNU Fortran compiler suite started supporting
-        what is required for MPI_SIZEOF.  We know that gfortran v4.8
-        (bundled in RHEL 7.x) supports the MPI_SIZEOF interfaces.
-        However, gfortran 4.4 (bundled in RHEL 6.x) does not.
-
   - The level of support provided by the mpi module is based on your
     Fortran compiler.