Keep in line with data type change in ToolboxLib

Detail:
  Fixes build error with Toolbox-1_18.
  Ref: https://www.riscosopen.org/forum/forums/4/topics/15413

Version 0.18. Tagged as 'MousSetup-0_18'

VersionNum

-/* (0.17)
+/* (0.18)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
  *
  */
-#define Module_MajorVersion_CMHG        0.17
+#define Module_MajorVersion_CMHG        0.18
 #define Module_MinorVersion_CMHG
-#define Module_Date_CMHG                28 Mar 2020
+#define Module_Date_CMHG                30 Jun 2020
 
-#define Module_MajorVersion             "0.17"
-#define Module_Version                  17
+#define Module_MajorVersion             "0.18"
+#define Module_Version                  18
 #define Module_MinorVersion             ""
-#define Module_Date                     "28 Mar 2020"
+#define Module_Date                     "30 Jun 2020"
 
-#define Module_ApplicationDate          "28-Mar-20"
+#define Module_ApplicationDate          "30-Jun-20"
 
 #define Module_ComponentName            "MousSetup"
 
-#define Module_FullVersion              "0.17"
-#define Module_HelpVersion              "0.17 (28 Mar 2020)"
-#define Module_LibraryVersionInfo       "0:17"
+#define Module_FullVersion              "0.18"
+#define Module_HelpVersion              "0.18 (30 Jun 2020)"
+#define Module_LibraryVersionInfo       "0:18"

c/Main

@@ -62,7 +62,7 @@ static	IdBlock		id_block;
 static ObjectId auto_scrollbar(const char *windowname)
 {
   int  screeny;
-  ObjectTemplateHeader *objtemplate;
+  const ObjectTemplateHeader *objtemplate;
   WindowTemplate       *wintemplate;
   WimpWindow           *windef;
   ObjectId              window_id;