Give jsdoor the same treatement jsexec got.

src/sbbs3/jsdoor.c

@@ -46,6 +46,9 @@
 
 #include "sbbs.h"
 #include "ciolib.h"
+#ifdef main
+ #undef main
+#endif
 #include "ini_file.h"
 #include "js_rtpool.h"
 #include "js_request.h"