Previous check-in missed a header file.

Detail:
  Libs-0_12 was changed to stop the 'wimp' header for screwing-up the
  definition of various service calls. Sadly, there is another copy
  of the self-same, broken, header file in the 'toolboxlib.h'
  directory. I've changed this to match the changes Andrew made in
  the previous check-in to 'h.wimp'.
Admin:
  To be tested in STB-400 ROM build 19

Version 0.13. Tagged as 'Libs-0_13'

toolboxlib/h/wimp

@@ -104,20 +104,22 @@
 #define Wimp_RemoveMessages                     0x400F7
 #define Wimp_SetColourMapping                   0x400F8
 
-#define Service_Memory                          0x11
-#define Service_StartWimp                       0x49
-#define Service_StartedWimp                     0x4A
-#define Service_PremodeChange                   0x4D
-#define Service_MouseTrap                       0x52
-#define Service_WimpCloseDown                   0x53
-#define Service_WimpReportError                 0x57
-#define Service_WimpSaveDesktop                 0x5C
-#define Service_WimpPalette                     0x5D
-#define Service_DesktopWelcome                  0x7C
-#define Service_ShutDown                        0x7E
-#define Service_ShutDownComplete                0x80
-#define Service_WimpSpritesMoved                0x85
-#define Service_WimpRegisterFilters             0x86
+#ifndef Service_Memory
+#define Service_Memory                           (0x11)
+#define Service_StartWimp                        (0x49)
+#define Service_StartedWimp                      (0x4a)
+#define Service_PremodeChange                    (0x4d)
+#define Service_MouseTrap                        (0x52)
+#define Service_WimpCloseDown                    (0x53)
+#define Service_WimpReportError                  (0x57)
+#define Service_WimpSaveDesktop                  (0x5c)
+#define Service_WimpPalette                      (0x5d)
+#define Service_DesktopWelcome                   (0x7c)
+#define Service_ShutDown                         (0x7e)
+#define Service_ShutDownComplete                 (0x80)
+#define Service_WimpSpritesMoved                 (0x85)
+#define Service_WimpRegisterFilters              (0x86)
+#endif
 
 #endif