Bug#897715: link to #897899

[Emmanuel Promayon]

This is the actual error (it occurs everytime the gcc changes its major 
version)
```
/usr/include/ITK-4.12/vcl_compiler.h:90:4: error: #error "Dunno about 
this gcc"
 #  error "Dunno about this gcc"
```
This bug should probably be reassigned to src:insighttoolkit4 bug #897899

This is the same problem for #897756 #897759 and #897859

Thanks