[patch] mark one instance of tun_fwd_ifnames as extern

[Hanno Böck]

Hi,

The global variable tun_fwd_ifnames is used in both session.c and
serverloop.c.

This means one of them has to be marked as extern. Most compilers will
ignore such errors, but it's not correct. E.g. in gcc you can enable a
stricter handling of global variables with -fno-common.

See attached patch, which will mark it as extern in sessions.c. (the
other variables in that block are already marked extern, so it seems
fitting.)

-- 
Hanno Böck
https://hboeck.de/

mail/jabber: hanno at hboeck.de
GPG: FE73757FA60E4E21B937579FA5880072BBB51E42
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