Auto merge of #2119 - oherrala:64bit-musl-so-incoming-cpu, r=JohnTitor

Define SO_INCOMING_CPU for {aarch64,x86_64}-unknown-linux-musl

This continues where #2115 left off and hopefully fixes `socket2` crate on these two targets.

Author: bors

src/unix/linux_like/linux/musl/b64/aarch64/mod.rs

@@ -194,6 +194,7 @@ pub const SO_SNDBUFFORCE: ::c_int = 32;
 pub const SO_RCVBUFFORCE: ::c_int = 33;
 pub const SO_PROTOCOL: ::c_int = 38;
 pub const SO_DOMAIN: ::c_int = 39;
+pub const SO_INCOMING_CPU: ::c_int = 49;
 
 pub const SA_ONSTACK: ::c_int = 0x08000000;
 pub const SA_SIGINFO: ::c_int = 0x00000004;

src/unix/linux_like/linux/musl/b64/x86_64/mod.rs

@@ -827,6 +827,7 @@ pub const SO_SNDBUFFORCE: ::c_int = 32;
 pub const SO_RCVBUFFORCE: ::c_int = 33;
 pub const SO_PROTOCOL: ::c_int = 38;
 pub const SO_DOMAIN: ::c_int = 39;
+pub const SO_INCOMING_CPU: ::c_int = 49;
 
 pub const MAP_ANON: ::c_int = 0x0020;
 pub const MAP_GROWSDOWN: ::c_int = 0x0100;