build: i386/pc686/appstart.o is created more than once

[Sebastian Huber]

On 15/09/2020 15:21, Sebastian Huber wrote:

> Hello,
>
> please have a look at:
>
> https://devel.rtems.org/ticket/4079
>
> I have no idea how this can be done in waf.

Thomas Nagy helped me to fix this issue. I would have probably never 
found this solution myself:

https://git.rtems.org/rtems/commit/?id=9979042a3a40ab5e59ff06dae0fc229cd8bb0cc9