macos: add TCP_FASTOPEN_FORCE_ENABLE

This is used to disable the backoff mechanism, otherwise TFO is basically unusable. Updates rust-lang#1632 and rust-lang#1635 Definition: https://github.com/apple/darwin-xnu/blob/2ff845c2e033bd0ff64b5b6aa6063a1f8f65aa32/bsd/netinet/tcp.h#L310 Related commits/PRs: zonyitoo/tokio-tfo#5, database64128/tfo-go@c980f6b
database64128 · Mar 3, 2023 · 08b2969 · 08b2969
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diff --git a/libc-test/semver/apple.txt b/libc-test/semver/apple.txt
@@ -1349,6 +1349,7 @@ TAB2
 TAB3
 TABDLY
 TCP_FASTOPEN
+TCP_FASTOPEN_FORCE_ENABLE
 TCP_KEEPALIVE
 TCP_KEEPCNT
 TCP_KEEPINTVL

diff --git a/src/unix/bsd/apple/mod.rs b/src/unix/bsd/apple/mod.rs
@@ -3657,6 +3657,8 @@ pub const TCP_KEEPINTVL: ::c_int = 0x101;
 pub const TCP_KEEPCNT: ::c_int = 0x102;
 /// Enable/Disable TCP Fastopen on this socket
 pub const TCP_FASTOPEN: ::c_int = 0x105;
+/// Disable/Enable TCP Fastopen backoff mechanism.
+pub const TCP_FASTOPEN_FORCE_ENABLE: ::c_int = 0x218;
 
 pub const SOL_LOCAL: ::c_int = 0;