Adopt C99 <stdint.h> integer types.

The annoying int64.h is completely retired, since C99 guarantees a
64-bit integer type that you can actually treat like an ordinary
integer. Also, I've replaced the local typedefs uint32 and word32
(scattered through different parts of the crypto code) with the
standard uint32_t.

defs.h

@@ -12,6 +12,15 @@
 #define PUTTY_DEFS_H
 
 #include <stddef.h>
+#include <stdint.h>
+
+#if defined _MSC_VER && _MSC_VER < 1800
+/* Work around lack of inttypes.h in older MSVC */
+#define PRIu64 "I64u"
+#define SCNu64 "I64u"
+#else
+#include <inttypes.h>
+#endif
 
 #ifndef FALSE
 #define FALSE 0
@@ -32,9 +41,6 @@ typedef struct strbuf strbuf;
 
 struct RSAKey;
 
-#include <stdint.h>
-typedef uint32_t uint32;
-
 typedef struct BinarySink BinarySink;
 typedef struct BinarySource BinarySource;