Auto merge of #924 - kristate:android_eth_p_fix, r=alexcrichton

Add ETH_* constants on Android

Adding ETH_* constants that were found here on Linux but not on Android.

Source Reference is [linux/if_ether.h](https://android.googlesource.com/platform/bionic/+/master/libc/kernel/uapi/linux/if_ether.h) on Google OpenSource.

Thank-you.

/cc nix-rust/nix#865

src/unix/notbsd/android/mod.rs

@@ -1071,6 +1071,108 @@ pub const IFF_TUN: ::c_int = 0x0001;
 pub const IFF_TAP: ::c_int = 0x0002;
 pub const IFF_NO_PI: ::c_int = 0x1000;
 
+// start android/platform/bionic/libc/kernel/uapi/linux/if_ether.h
+// from https://android.googlesource.com/
+// platform/bionic/+/master/libc/kernel/uapi/linux/if_ether.h
+pub const ETH_ALEN: ::c_int = 6;
+pub const ETH_HLEN: ::c_int = 14;
+pub const ETH_ZLEN: ::c_int = 60;
+pub const ETH_DATA_LEN: ::c_int = 1500;
+pub const ETH_FRAME_LEN: ::c_int = 1514;
+pub const ETH_FCS_LEN: ::c_int = 4;
+pub const ETH_MIN_MTU: ::c_int = 68;
+pub const ETH_MAX_MTU: ::c_int = 0xFFFF;
+pub const ETH_P_LOOP: ::c_int = 0x0060;
+pub const ETH_P_PUP: ::c_int = 0x0200;
+pub const ETH_P_PUPAT: ::c_int = 0x0201;
+pub const ETH_P_TSN: ::c_int = 0x22F0;
+pub const ETH_P_IP: ::c_int = 0x0800;
+pub const ETH_P_X25: ::c_int = 0x0805;
+pub const ETH_P_ARP: ::c_int = 0x0806;
+pub const ETH_P_BPQ: ::c_int = 0x08FF;
+pub const ETH_P_IEEEPUP: ::c_int = 0x0a00;
+pub const ETH_P_IEEEPUPAT: ::c_int = 0x0a01;
+pub const ETH_P_BATMAN: ::c_int = 0x4305;
+pub const ETH_P_DEC: ::c_int = 0x6000;
+pub const ETH_P_DNA_DL: ::c_int = 0x6001;
+pub const ETH_P_DNA_RC: ::c_int = 0x6002;
+pub const ETH_P_DNA_RT: ::c_int = 0x6003;
+pub const ETH_P_LAT: ::c_int = 0x6004;
+pub const ETH_P_DIAG: ::c_int = 0x6005;
+pub const ETH_P_CUST: ::c_int = 0x6006;
+pub const ETH_P_SCA: ::c_int = 0x6007;
+pub const ETH_P_TEB: ::c_int = 0x6558;
+pub const ETH_P_RARP: ::c_int = 0x8035;
+pub const ETH_P_ATALK: ::c_int = 0x809B;
+pub const ETH_P_AARP: ::c_int = 0x80F3;
+pub const ETH_P_8021Q: ::c_int = 0x8100;
+/* see rust-lang/libc#924 pub const ETH_P_ERSPAN: ::c_int = 0x88BE;*/
+pub const ETH_P_IPX: ::c_int = 0x8137;
+pub const ETH_P_IPV6: ::c_int = 0x86DD;
+pub const ETH_P_PAUSE: ::c_int = 0x8808;
+pub const ETH_P_SLOW: ::c_int = 0x8809;
+pub const ETH_P_WCCP: ::c_int = 0x883E;
+pub const ETH_P_MPLS_UC: ::c_int = 0x8847;
+pub const ETH_P_MPLS_MC: ::c_int = 0x8848;
+pub const ETH_P_ATMMPOA: ::c_int = 0x884c;
+pub const ETH_P_PPP_DISC: ::c_int = 0x8863;
+pub const ETH_P_PPP_SES: ::c_int = 0x8864;
+pub const ETH_P_LINK_CTL: ::c_int = 0x886c;
+pub const ETH_P_ATMFATE: ::c_int = 0x8884;
+pub const ETH_P_PAE: ::c_int = 0x888E;
+pub const ETH_P_AOE: ::c_int = 0x88A2;
+pub const ETH_P_8021AD: ::c_int = 0x88A8;
+pub const ETH_P_802_EX1: ::c_int = 0x88B5;
+pub const ETH_P_TIPC: ::c_int = 0x88CA;
+pub const ETH_P_MACSEC: ::c_int = 0x88E5;
+pub const ETH_P_8021AH: ::c_int = 0x88E7;
+pub const ETH_P_MVRP: ::c_int = 0x88F5;
+pub const ETH_P_1588: ::c_int = 0x88F7;
+pub const ETH_P_NCSI: ::c_int = 0x88F8;
+pub const ETH_P_PRP: ::c_int = 0x88FB;
+pub const ETH_P_FCOE: ::c_int = 0x8906;
+/* see rust-lang/libc#924 pub const ETH_P_IBOE: ::c_int = 0x8915;*/
+pub const ETH_P_TDLS: ::c_int = 0x890D;
+pub const ETH_P_FIP: ::c_int = 0x8914;
+pub const ETH_P_80221: ::c_int = 0x8917;
+pub const ETH_P_HSR: ::c_int = 0x892F;
+/* see rust-lang/libc#924 pub const ETH_P_NSH: ::c_int = 0x894F;*/
+pub const ETH_P_LOOPBACK: ::c_int = 0x9000;
+pub const ETH_P_QINQ1: ::c_int = 0x9100;
+pub const ETH_P_QINQ2: ::c_int = 0x9200;
+pub const ETH_P_QINQ3: ::c_int = 0x9300;
+pub const ETH_P_EDSA: ::c_int = 0xDADA;
+/* see rust-lang/libc#924 pub const ETH_P_IFE: ::c_int = 0xED3E;*/
+pub const ETH_P_AF_IUCV: ::c_int = 0xFBFB;
+pub const ETH_P_802_3_MIN: ::c_int = 0x0600;
+pub const ETH_P_802_3: ::c_int = 0x0001;
+pub const ETH_P_AX25: ::c_int = 0x0002;
+pub const ETH_P_ALL: ::c_int = 0x0003;
+pub const ETH_P_802_2: ::c_int = 0x0004;
+pub const ETH_P_SNAP: ::c_int = 0x0005;
+pub const ETH_P_DDCMP: ::c_int = 0x0006;
+pub const ETH_P_WAN_PPP: ::c_int = 0x0007;
+pub const ETH_P_PPP_MP: ::c_int = 0x0008;
+pub const ETH_P_LOCALTALK: ::c_int = 0x0009;
+pub const ETH_P_CAN: ::c_int = 0x000C;
+pub const ETH_P_CANFD: ::c_int = 0x000D;
+pub const ETH_P_PPPTALK: ::c_int = 0x0010;
+pub const ETH_P_TR_802_2: ::c_int = 0x0011;
+pub const ETH_P_MOBITEX: ::c_int = 0x0015;
+pub const ETH_P_CONTROL: ::c_int = 0x0016;
+pub const ETH_P_IRDA: ::c_int = 0x0017;
+pub const ETH_P_ECONET: ::c_int = 0x0018;
+pub const ETH_P_HDLC: ::c_int = 0x0019;
+pub const ETH_P_ARCNET: ::c_int = 0x001A;
+pub const ETH_P_DSA: ::c_int = 0x001B;
+pub const ETH_P_TRAILER: ::c_int = 0x001C;
+pub const ETH_P_PHONET: ::c_int = 0x00F5;
+pub const ETH_P_IEEE802154: ::c_int = 0x00F6;
+pub const ETH_P_CAIF: ::c_int = 0x00F7;
+pub const ETH_P_XDSA: ::c_int = 0x00F8;
+/* see rust-lang/libc#924 pub const ETH_P_MAP: ::c_int = 0x00F9;*/
+// end android/platform/bionic/libc/kernel/uapi/linux/if_ether.h
+
 f! {
     pub fn CPU_ZERO(cpuset: &mut cpu_set_t) -> () {
         for slot in cpuset.__bits.iter_mut() {