[BIRD 1.6.x] Unix: fix compilation with GCC 10

[Ondrej Zajicek]

On Mon, Sep 28, 2020 at 03:01:12PM +0200, Vincent Bernat wrote:
> GCC 10 will now error when declaring a global variable twice:
>  https://gcc.gnu.org/gcc-10/porting_to.html#common
> 
> Fix this issue by declaring the variable as `extern' in `krt.h'. The
> variable is really declared in `krt.c'.

Thanks, merged. I noticed this issue in Debian bugreport mails, as they
compile Testing with GCC 10. Unfortunately, GCC 10 is not in Backports.

-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
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"To err is human -- to blame it on a computer is even more so."