Fix Windows Compiler error C2011

Fixes #561

Signed-off-by: Benn Snyder <benn.snyder@gmail.com>

Author: Finn

wrappers/c_sync/libfreenect_sync.c

@@ -24,6 +24,9 @@
  * either License.
  */
 #include <stdio.h>
+#ifdef _MSC_VER
+#define HAVE_STRUCT_TIMESPEC
+#endif
 #include <pthread.h>
 #include <string.h>
 #include <stdlib.h>