Add the BEGIN/END_C_DECLS declarations.

This commit was SVN r19445.

opal/util/arch.h

@@ -230,6 +230,8 @@
 
 #define OPAL_ARCH_LDISINTEL       0x00800000
 
+BEGIN_C_DECLS
+
 OPAL_DECLSPEC int32_t opal_arch_compute_local_id( uint32_t *var);
 
 OPAL_DECLSPEC int32_t opal_arch_checkmask ( uint32_t *var, uint32_t mask );
@@ -286,5 +288,7 @@ static inline void opal_arch_setmask ( uint32_t *var, uint32_t mask)
     *var |= mask;
 }
 
+END_C_DECLS
+
 #endif  /* OPAL_ARCH_H_HAS_BEEN_INCLUDED */