Rollup merge of rust-lang#145511 - semarie:push-rnytptsoxrxn, r=joshtriplett

Rust build fails on OpenBSD after using file_lock feature

PR 130999 added the file_lock feature, but doesn't included OpenBSD in the supported targets (Tier 3 platform), leading to a compilation error ("try_lock() not supported").

Cc ```@cberner```

Related to rust-lang#130999

Author: Zalathar

library/std/src/sys/fs/unix.rs

@@ -1264,6 +1264,7 @@ impl File {
         target_os = "fuchsia",
         target_os = "linux",
         target_os = "netbsd",
+        target_os = "openbsd",
         target_vendor = "apple",
     ))]
     pub fn lock(&self) -> io::Result<()> {
@@ -1276,6 +1277,7 @@ impl File {
         target_os = "fuchsia",
         target_os = "linux",
         target_os = "netbsd",
+        target_os = "openbsd",
         target_vendor = "apple",
     )))]
     pub fn lock(&self) -> io::Result<()> {
@@ -1287,6 +1289,7 @@ impl File {
         target_os = "fuchsia",
         target_os = "linux",
         target_os = "netbsd",
+        target_os = "openbsd",
         target_vendor = "apple",
     ))]
     pub fn lock_shared(&self) -> io::Result<()> {
@@ -1299,6 +1302,7 @@ impl File {
         target_os = "fuchsia",
         target_os = "linux",
         target_os = "netbsd",
+        target_os = "openbsd",
         target_vendor = "apple",
     )))]
     pub fn lock_shared(&self) -> io::Result<()> {
@@ -1310,6 +1314,7 @@ impl File {
         target_os = "fuchsia",
         target_os = "linux",
         target_os = "netbsd",
+        target_os = "openbsd",
         target_vendor = "apple",
     ))]
     pub fn try_lock(&self) -> Result<(), TryLockError> {
@@ -1330,6 +1335,7 @@ impl File {
         target_os = "fuchsia",
         target_os = "linux",
         target_os = "netbsd",
+        target_os = "openbsd",
         target_vendor = "apple",
     )))]
     pub fn try_lock(&self) -> Result<(), TryLockError> {
@@ -1344,6 +1350,7 @@ impl File {
         target_os = "fuchsia",
         target_os = "linux",
         target_os = "netbsd",
+        target_os = "openbsd",
         target_vendor = "apple",
     ))]
     pub fn try_lock_shared(&self) -> Result<(), TryLockError> {
@@ -1364,6 +1371,7 @@ impl File {
         target_os = "fuchsia",
         target_os = "linux",
         target_os = "netbsd",
+        target_os = "openbsd",
         target_vendor = "apple",
     )))]
     pub fn try_lock_shared(&self) -> Result<(), TryLockError> {
@@ -1378,6 +1386,7 @@ impl File {
         target_os = "fuchsia",
         target_os = "linux",
         target_os = "netbsd",
+        target_os = "openbsd",
         target_vendor = "apple",
     ))]
     pub fn unlock(&self) -> io::Result<()> {
@@ -1390,6 +1399,7 @@ impl File {
         target_os = "fuchsia",
         target_os = "linux",
         target_os = "netbsd",
+        target_os = "openbsd",
         target_vendor = "apple",
     )))]
     pub fn unlock(&self) -> io::Result<()> {