Add IP_RECVTTL and IPV6_RECVHOPLIMIT for Apple platforms

Author: larseggert

src/unix/bsd/apple/mod.rs

@@ -4075,6 +4075,7 @@ pub const IP_RECVDSTADDR: ::c_int = 7;
 pub const IP_ADD_MEMBERSHIP: ::c_int = 12;
 pub const IP_DROP_MEMBERSHIP: ::c_int = 13;
 pub const IP_RECVIF: ::c_int = 20;
+pub const IP_RECVTTL: ::c_int = 24;
 pub const IP_BOUND_IF: ::c_int = 25;
 pub const IP_PKTINFO: ::c_int = 26;
 pub const IP_RECVTOS: ::c_int = 27;
@@ -4084,6 +4085,7 @@ pub const IPV6_LEAVE_GROUP: ::c_int = 13;
 pub const IPV6_CHECKSUM: ::c_int = 26;
 pub const IPV6_RECVTCLASS: ::c_int = 35;
 pub const IPV6_TCLASS: ::c_int = 36;
+pub const IPV6_RECVHOPLIMIT: ::c_int = 37;
 pub const IPV6_PKTINFO: ::c_int = 46;
 pub const IPV6_HOPLIMIT: ::c_int = 47;
 pub const IPV6_RECVPKTINFO: ::c_int = 61;