Don't document a bug that Jeff found as life as it stands (Refs trac:387)

This commit was SVN r12124.

The following Trac tickets were found above:
  Ticket 387 --> https://svn.open-mpi.org/trac/ompi/ticket/387

README

@@ -278,9 +278,7 @@ base as of this writing (12 Sep 2006):
   interface.  A "large" size that includes the two choice buffer MPI
   functions is possible in future versions of Open MPI.
 
-- MPI::SEEK_* constants are now supported in C++ MPI applications, but
-  only if "mpi.h" is included after system-level header files that
-  define the POSIX SEEK_* constants (such as <stdio.h> or <iostream>).
+- MPI::SEEK_* constants are now supported in C++ MPI applications.
 
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