BUILD: makefile: Update feature flags for NetBSD
This updates the feature flags for NetBSD.
NetBSD 8 adds support for accept4().
Enable getaddrinfo().
diff --git a/INSTALL b/INSTALL
index 0263cf3..2ae98bf 100644
--- a/INSTALL
+++ b/INSTALL
@@ -377,7 +377,7 @@
- solaris for Solaris 10 and above
- freebsd for FreeBSD 10 and above
- dragonfly for DragonFlyBSD 4.3 and above
- - netbsd for NetBSD
+ - netbsd for NetBSD 8 and above
- osx for Mac OS/X
- openbsd for OpenBSD 6.3 and above
- aix51 for AIX 5.1