Some updates to make the code compatible with VC 9 (2008)

VC 9 doesn't support late variable declarations, and doesn't have inttypes
so we need some direct definitions of a couple of more types.

printbuf.c

@@ -65,7 +65,7 @@ int printbuf_memappend(struct printbuf *p, const char *buf, int size)
   return size;
 }
 
-#if !HAVE_VSNPRINTF && defined(WIN32)
+#if !HAVE_VSNPRINTF && defined(_MSC_VER)
 # define vsnprintf _vsnprintf
 #elif !HAVE_VSNPRINTF /* !HAVE_VSNPRINTF */
 # error Need vsnprintf!