Fix compilation (on Cygwin), by adding the necessary includes.

lanurmi · danmar · commit e3bdc37b0c82 · 2014-09-25T05:32:30.000+02:00
diff --git a/test/testrunner.cpp b/test/testrunner.cpp
@@ -16,6 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <cstdio>
 #include <cstdlib>
 #include "testsuite.h"
 #include "options.h"
