Net::Frame::Simple has a long dependency chain, avoid porting, skip tests

Index: t/104-offer-o90-o120.t
--- t/104-offer-o90-o120.t.orig
+++ t/104-offer-o90-o120.t
@@ -4,6 +4,8 @@ use warnings;
 use Test::More tests => 3;
 use FindBin ();
 
+use Test::Requires qw(Net::Frame::Simple);
+
 BEGIN { use_ok('Net::DHCP::Packet'); }
 BEGIN { use_ok('Net::DHCP::Constants', ':bootp_codes'); }
 
