Check for c99 with autoconf versions prior to 2.70 #936
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Recently c99 code snuck into unbound:
https://github.com/NLnetLabs/unbound/blob/master/util/net_help.c#L829
There are some ancient versions of gcc that support c99 but don't default to it, this is the same change as in nsd:
NLnetLabs/nsd@8672db2
See also
NLnetLabs/nsd#222
and
NLnetLabs/nsd#219