Revert r14286; it worked for icc, but not for gcc. #$%@#$%

Sorry for configure changes during the day; I totally forgot about
that.  :-(

This commit was SVN r14288.

The following SVN revision numbers were found above:
  r14286 --> open-mpi/ompi@0083eba18e

ompi/mca/io/romio/romio/configure.in

@@ -1987,14 +1987,7 @@ else
    F77MPIOINC="include 'mpiof.h'"
 fi
 
-# Open MPI: OMPI's top-level configure script already has a check for
-# "restrict"; PAC_C_RESTRICT seems to sometimes come up with a
-# different answer than the OMPI top-level test, resulting in
-# conflicting #define's for the keyword "restrict" (e.g., using icc
-# compilers on Linux).  So just comment out PAC_C_RESTRICT and use the
-# #define from the top-level OMPI configure test.
-# #define's for restrict).
-dnl PAC_C_RESTRICT
+PAC_C_RESTRICT
 PAC_C_GNU_ATTRIBUTE
 #
 dnl CFLAGS="$CFLAGS $DEFS"