Fix a typo in the predefined common protocols to make "udp" resolve
without netbase. Upstream change 33554.
diff --git a/ext/IO/lib/IO/Socket/INET.pm b/ext/IO/lib/IO/Socket/INET.pm
index f8bb338..2f0e5d1 100644
--- a/ext/IO/lib/IO/Socket/INET.pm
+++ b/ext/IO/lib/IO/Socket/INET.pm
@@ -27,7 +27,7 @@ my %socket_type = ( tcp => SOCK_STREAM,
);
my %proto_number;
$proto_number{tcp} = Socket::IPPROTO_TCP() if defined &Socket::IPPROTO_TCP;
-$proto_number{upd} = Socket::IPPROTO_UDP() if defined &Socket::IPPROTO_UDP;
+$proto_number{udp} = Socket::IPPROTO_UDP() if defined &Socket::IPPROTO_UDP;
$proto_number{icmp} = Socket::IPPROTO_ICMP() if defined &Socket::IPPROTO_ICMP;
my %proto_name = reverse %proto_number;