blaze_util_posix.cc: fix order of #define

On some systems (including some versions of FreeBSD) it is a requirement
that _WITH_DPRINTF be defined for <stdio.h> to provide the appropriate
header for dprintf(3). Therefore, the respective #define has to come
before any #include as those might pull is <stdio.h>.

Change-Id: I25d55c9c7c0912e8619faf774d2e09f9af9a6a53
PiperOrigin-RevId: 203351202

src/main/cpp/blaze_util_posix.cc

@@ -12,9 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#define _WITH_DPRINTF
 #include "src/main/cpp/blaze_util_platform.h"
 
-#define _WITH_DPRINTF
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>