Make glue generation shutdown more graceful

(cherry picked from commit 23907e6f19)

main/main.cpp

@@ -2206,9 +2206,10 @@ void Main::force_redraw() {
  * so that the engine closes cleanly without leaking memory or crashing.
  * The order matters as some of those steps are linked with each other.
  */
-void Main::cleanup() {
-
-	ERR_FAIL_COND(!_start_success);
+void Main::cleanup(bool p_force) {
+	if (!p_force) {
+		ERR_FAIL_COND(!_start_success);
+	}
 
 	if (script_debugger) {
 		// Flush any remaining messages

main/main.h

@@ -56,7 +56,7 @@ public:
 
 	static bool is_iterating();
 
-	static void cleanup();
+	static void cleanup(bool p_force = false);
 };
 
 #endif // MAIN_H

modules/mono/editor/bindings_generator.cpp

@@ -39,6 +39,7 @@
 #include "core/os/file_access.h"
 #include "core/os/os.h"
 #include "core/ucaps.h"
+#include "main/main.h"
 
 #include "../glue/cs_glue_version.gen.h"
 #include "../godotsharp_defs.h"
@@ -3126,6 +3127,7 @@ void BindingsGenerator::handle_cmdline_args(const List<String> &p_cmdline_args)
 
 		if (!bindings_generator.initialized) {
 			ERR_PRINTS("Failed to initialize the bindings generator");
+			Main::cleanup(true);
 			::exit(0);
 		}
 
@@ -3148,6 +3150,7 @@ void BindingsGenerator::handle_cmdline_args(const List<String> &p_cmdline_args)
 		}
 
 		// Exit once done
+		Main::cleanup(true);
 		::exit(0);
 	}
 }