Configure: disabled IP_PKTINFO feature on certain platforms.

On Cygwin and NetBSD 7.0+ struct in_pktinfo has no ipi_spec_dst field, which
caused nginx compilation error.  Now presence of this field is ensured by the
IP_PKTINFO feature test.

The problem was introduced by dbb0c854e308 (1.13.0).
1 file changed
tree: 59ae09eb41e5ed23a1e2b7f3bc0ae7862ec4dd0a
  1. auto/
  2. conf/
  3. contrib/
  4. docs/
  5. misc/
  6. src/
  7. .hgtags