Under gcc 4.2.4, make check was failing without the <stdio.h>.

Moreover, I could not figure out why <time.h> would need to be
included twice.  So, I substituted the former for the latter,
in the superfluous instantiation.

This commit was SVN r19859.

test/datatype/ddt_test.c

@@ -27,7 +27,7 @@
 #ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>
 #endif
-#include <time.h>
+#include <stdio.h>
 
 /* Compile with:
 mpicc -DHAVE_CONFIG_H -I. -I../../include -I../../../ompi-trunk/include  -I../.. -I../../include -I../../../ompi-trunk/opal -I../../../ompi-trunk/orte -I../../../ompi-trunk/ompi -g ddt_test.c -o ddt_test