widl: Include objbase.h so that generated proxy file compiles on Wine.

tools/makedep.c

@@ -709,6 +709,7 @@ static void parse_generated_idl( INCL_FILE *source )
     }
     else if (strendswith( source->name, "_p.c" ))
     {
+        add_include( source, "objbase.h", 0, 1 );
         add_include( source, "rpcproxy.h", 0, 1 );
         add_include( source, header, 0, 0 );
     }

tools/widl/proxy.c

@@ -94,6 +94,7 @@ static void init_proxy(ifref_t *ifaces)
   print_proxy( "#define __REQUIRED_RPCPROXY_H_VERSION__ 440\n");
   print_proxy( "#endif /* __REDQ_RPCPROXY_H_VERSION__ */\n");
   print_proxy( "\n");
+  print_proxy( "#include \"objbase.h\"\n");
   print_proxy( "#include \"rpcproxy.h\"\n");
   print_proxy( "#ifndef __RPCPROXY_H_VERSION__\n");
   print_proxy( "#error This code needs a newer version of rpcproxy.h\n");