(svn r16508) [0.7] -Backport from trunk:

- Fix: Base graphics names must be unique, so do not add duplicates (r16503)
- Fix: [NoAI] When an AI was suspended while in a function called (indirectly) via call/acall/pcall OpenTTD crashed. Fix this by disallowing AIs to be suspended while called via call/acall/pcall [FS#2935] (r16502)

src/script/squirrel.cpp

@@ -508,3 +508,8 @@ void Squirrel::ResetCrashed()
 {
 	this->crashed = false;
 }
+
+bool Squirrel::CanSuspend()
+{
+	return sq_can_suspend(this->vm);
+}