[Buildroot] package/xtables-addons: bump version to 3.7

[Peter Korsgaard]

>>>>> "Nathaniel" == Nathaniel Roach <nroach44 at nroach44.id.au> writes:

 > Resolves build failure with Linux 5.4
 > Signed-off-by: Nathaniel Roach <nroach44 at nroach44.id.au>

Committed, thanks.

-- 
Bye, Peter Korsgaard