bugfix for [32368] Added controllers don't count over 10

Blender original code (NaN likely) was relying on strcmp to sort the list of controllers.
As it happens, in strcmp 10 < 2, thus the list was never in the right order.

The curious thing is that in 2.49 it worked, but I think it did because the make_unique_prop_names function was called twice. Strange ;)
The solution is to use blender BLI_natstrcmp to do natural sorting

source/blender/editors/space_logic/logic_window.c

@@ -109,7 +109,7 @@ static int vergname(const void *v1, const void *v2)
 	x1= (char **)v1;
 	x2= (char **)v2;
 	
-	return strcmp(*x1, *x2);
+	return BLI_natstrcmp(*x1, *x2);
 }
 
 void make_unique_prop_names(bContext *C, char *str)