Header protection.

This commit was SVN r8441.

ompi/mca/coll/sm/coll_sm_module.c

@@ -32,8 +32,12 @@
 #include <sched.h>
 #endif
 #include <sys/types.h>
+#ifdef HAVE_SYS_MMAN_H
 #include <sys/mman.h>
+#endif  /* HAVE_SYS_MMAN_H */
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif  /* HAVE_UNISTD_H */
 
 #include "mpi.h"
 #include "opal/mca/maffinity/maffinity.h"