fixed missing errno.h on some architectures

This commit was SVN r17186.

ompi/mca/pml/v/vprotocol/pessimist/vprotocol_pessimist_sender_based.c

@@ -17,6 +17,8 @@
 #if defined(HAVE_UNISTD_H)
 #include <unistd.h>
 #endif
+#include <string.h>
+#include <errno.h>
 #include "ompi/datatype/datatype_memcpy.h"
 #include <fcntl.h>