Add exclusion defs & remaining funcs, remove internal types &
obj_base.h (sync with win version), fixed a number of function
prototypes.

diff --git a/dlls/wininet/http.c b/dlls/wininet/http.c
index 56235b8..aa06ff3 100644
--- a/dlls/wininet/http.c
+++ b/dlls/wininet/http.c
@@ -25,6 +25,7 @@
 #include "wininet.h"
 #include "winreg.h"
 #include "winerror.h"
+#define NO_SHLWAPI_STREAM
 #include "shlwapi.h"
 
 #include "internet.h"