user32: Add stub for EnableMouseInPointer().

dlls/api-ms-win-rtcore-ntuser-wmpointer-l1-1-0/api-ms-win-rtcore-ntuser-wmpointer-l1-1-0.spec

-@ stub EnableMouseInPointer
+@ stdcall EnableMouseInPointer(long) user32.EnableMouseInPointer
 @ stub GetCurrentInputMessageSource
 @ stub GetPointerCursorId
 @ stub GetPointerDevice

dlls/user32/input.c

@@ -1514,3 +1514,14 @@ int WINAPI GetMouseMovePointsEx(UINT size, LPMOUSEMOVEPOINT ptin, LPMOUSEMOVEPOI
     SetLastError(ERROR_POINT_NOT_FOUND);
     return -1;
 }
+
+/***********************************************************************
+ *		EnableMouseInPointer (USER32.@)
+ */
+BOOL WINAPI EnableMouseInPointer(BOOL enable)
+{
+    FIXME("(%#x) stub\n", enable);
+
+    SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
+    return FALSE;
+}

dlls/user32/user32.spec

@@ -203,6 +203,7 @@
 @ stdcall EditWndProc(long long long long) EditWndProcA
 @ stdcall EmptyClipboard()
 @ stdcall EnableMenuItem(long long long)
+@ stdcall EnableMouseInPointer(long)
 @ stdcall EnableScrollBar(long long long)
 @ stdcall EnableWindow(long long)
 @ stdcall EndDeferWindowPos(long)