Fixups.

http/wasi_http.h

@@ -2,6 +2,7 @@
 #define __WASI_HTTP_H__
 
 #include <stdint.h>
+#include <stdbool.h>
 
 #define WASI_HTTP_TYPES_METHOD_GET 0
 #define WASI_HTTP_TYPES_METHOD_HEAD 1
@@ -14,6 +15,10 @@
 #define WASI_HTTP_TYPES_METHOD_PATCH 8
 #define WASI_HTTP_TYPES_METHOD_OTHER 9
 
+#define WASI_HTTP_TYPES_SCHEME_HTTP 0
+#define WASI_HTTP_TYPES_SCHEME_HTTPS 1
+#define WASI_HTTP_TYPES_SCHEME_OTHER 2
+
 #define GET WASI_HTTP_TYPES_METHOD_GET
 #define POST WASI_HTTP_TYPES_METHOD_POST
 #define PUT WASI_HTTP_TYPES_METHOD_PUT