fix MSVC build

src/sha1.c

@@ -86,19 +86,7 @@ A million repetitions of "a"
 #include <string.h>
 
 /* make sure the stdint.h types are available */
-#if defined(_MSC_VER) /* Microsoft Visual C++ */
-  typedef signed char             int8_t;
-  typedef short int               int16_t;
-  typedef int                     int32_t;
-  typedef __int64                 int64_t;
- 
-  typedef unsigned char             uint8_t;
-  typedef unsigned short int        uint16_t;
-  typedef unsigned int              uint32_t;
-  /* no uint64_t */
-#else
-#include <stdint.h>
-#endif
+#include "ostypes.h"
 
 #include "sha1.h"