Make binary portable and other fixes

src/scripting/bindings.cc

@@ -0,0 +1,10 @@
+#include "main.h"
+#include "scripting/decl.h"
+
+mrb_value get_mode(mrb_state *mrb, mrb_value self) {
+  return mrb_fixnum_value(mode);
+}
+
+void setup_ruby_bindings(mrb_state *mrb, RClass *C_module) {
+  mrb_define_module_function(mrb, C_module, "mode", get_mode, MRB_ARGS_NONE());
+}