Fix compile warnings on Windows

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/os/os-windows.h b/os/os-windows.h
index 18de839..f68f654 100644
--- a/os/os-windows.h
+++ b/os/os-windows.h
@@ -15,6 +15,8 @@
 #include "../file.h"
 #include "../log.h"
 
+#include "windows/posix.h"
+
 #define FIO_HAVE_ODIRECT
 #define FIO_HAVE_CPU_AFFINITY
 #define FIO_HAVE_CHARDEV_SIZE
@@ -36,9 +38,6 @@
 #define fio_swap32(x)	_byteswap_ulong(x)
 #define fio_swap64(x)	_byteswap_uint64(x)
 
-typedef off_t off64_t;
-typedef int clockid_t;
-
 typedef DWORD_PTR os_cpu_mask_t;
 
 #define CLOCK_REALTIME	1