removing freebsd 11 EOL proposal.

build.rs

@@ -56,18 +56,13 @@ fn main() {
         );
     }
 
-    // The ABI of libc used by libstd is backward compatible with FreeBSD 10.
-    // The ABI of libc from crates.io is backward compatible with FreeBSD 11.
-    //
     // On CI, we detect the actual FreeBSD version and match its ABI exactly,
     // running tests to ensure that the ABI is correct.
     match which_freebsd() {
-        Some(10) if libc_ci || rustc_dep_of_std => set_cfg("freebsd10"),
-        Some(11) if libc_ci => set_cfg("freebsd11"),
-        Some(12) if libc_ci => set_cfg("freebsd12"),
-        Some(13) if libc_ci => set_cfg("freebsd13"),
-        Some(14) if libc_ci => set_cfg("freebsd14"),
-        Some(_) | None => set_cfg("freebsd11"),
+        Some(12) if libc_ci => println!("cargo:rustc-cfg=freebsd12"),
+        Some(13) if libc_ci => println!("cargo:rustc-cfg=freebsd13"),
+        Some(14) if libc_ci => println!("cargo:rustc-cfg=freebsd14"),
+        Some(_) | None => println!("cargo:rustc-cfg=freebsd12"),
     }
 
     match emcc_version_code() {

ci/dox.sh

@@ -47,7 +47,7 @@ while read -r target; do
     rustup target add "${target}" || true
 
     # Enable extra configuration flags:
-    export RUSTDOCFLAGS="--cfg freebsd11"
+    export RUSTDOCFLAGS="--cfg freebsd12"
 
     # If cargo doc fails, then try with unstable feature:
     if ! cargo doc --target "${target}" \