Add missing fcntl constants. (#12409)

Author: max-muoto

stdlib/@tests/stubtest_allowlists/darwin-py311.txt

@@ -13,3 +13,8 @@ webbrowser.MacOSX.__init__
 spwd
 msilib(.[a-z]+)?
 ossaudiodev
+
+# Not present on all MacOS versions
+fcntl.F_OFD_GETLK
+fcntl.F_OFD_SETLK
+fcntl.F_OFD_SETLKW

stdlib/@tests/stubtest_allowlists/darwin-py312.txt

@@ -18,3 +18,8 @@ curses.window.get_wch
 spwd
 msilib(.[a-z]+)?
 ossaudiodev
+
+# Not present on all MacOS versions
+fcntl.F_OFD_GETLK
+fcntl.F_OFD_SETLK
+fcntl.F_OFD_SETLKW

stdlib/@tests/stubtest_allowlists/darwin-py313.txt

@@ -1,10 +1,4 @@
 # new in py313
-fcntl.F_GETNOSIGPIPE
-fcntl.F_OFD_GETLK
-fcntl.F_OFD_SETLK
-fcntl.F_OFD_SETLKW
-fcntl.F_RDAHEAD
-fcntl.F_SETNOSIGPIPE
 posixpath.splitroot
 
 # Exists locally on MacOS but not on GitHub

stdlib/fcntl.pyi

@@ -44,9 +44,10 @@ if sys.platform != "win32":
         F_SEAL_SHRINK: int
         F_SEAL_WRITE: int
         if sys.version_info >= (3, 9):
-            F_OFD_GETLK: int
-            F_OFD_SETLK: int
-            F_OFD_SETLKW: int
+            F_OFD_GETLK: Final[int]
+            F_OFD_SETLK: Final[int]
+            F_OFD_SETLKW: Final[int]
+
         if sys.version_info >= (3, 10):
             F_GETPIPE_SZ: int
             F_SETPIPE_SZ: int
@@ -123,6 +124,18 @@ if sys.platform != "win32":
         RWH_WRITE_LIFE_LONG: Final = 4
         RWH_WRITE_LIFE_EXTREME: Final = 5
 
+    if sys.version_info >= (3, 11) and sys.platform == "darwin":
+        F_OFD_SETLK: Final = 90
+        F_OFD_SETLKW: Final = 91
+        F_OFD_GETLK: Final = 92
+
+    if sys.version_info >= (3, 13) and sys.platform != "linux":
+        # OSx and NetBSD
+        F_GETNOSIGPIPE: Final[int]
+        F_SETNOSIGPIPE: Final[int]
+        # OSx and FreeBSD
+        F_RDAHEAD: Final[int]
+
     @overload
     def fcntl(fd: FileDescriptorLike, cmd: int, arg: int = 0, /) -> int: ...
     @overload