- Ewww, r20817 messed up PGI on Jaguar big time!

Now, while #include "ompi_config.h" is good and fine in order
   to have OMPI_DECLSPEC,
   here it led to stdint.h (with the uint8_t) being included early
   but INSIDE a namespace "MPI" {}.
   Of course it was included anymore (thinkg #define _STDINT_H), when
   it was required in opal/class/opal_hash_list.h
   NOT good.

 - opal/class/opal_object.h: Yeah, one can have nested extern "C" {}
   but it's not necessary. Instead just have the outer *_C_DECLS.

This commit was SVN r20837.

The following SVN revision numbers were found above:
  r20817 --> open-mpi/ompi@6f808d9b05

ompi/mpi/cxx/constants.h

@@ -18,8 +18,6 @@
 // $HEADER$
 //
 
-#include "ompi_config.h"
-
 // return  codes
 static const int SUCCESS = MPI_SUCCESS;
 static const int ERR_BUFFER = MPI_ERR_BUFFER;

opal/class/opal_object.h

@@ -378,8 +378,6 @@ do {                                                            \
 } while (0)
 #endif
 
-BEGIN_C_DECLS
-
 OPAL_DECLSPEC OBJ_CLASS_DECLARATION(opal_object_t);
 
 /* declarations *******************************************************/
@@ -405,7 +403,6 @@ OPAL_DECLSPEC void opal_class_initialize(opal_class_t *);
  */
 OPAL_DECLSPEC int opal_class_finalize(void);
 
-END_C_DECLS
 /**
  * Run the hierarchy of class constructors for this object, in a
  * parent-first order.