Fix a few other array size hacks

Sources:

* FreeBSD `__reserve_pad`: [1]
* NetBSD `accept_filter_arg`: https://man.netbsd.org/setsockopt.2

[1]: https://github.com/freebsd/freebsd-src/blob/4b4e88d9425b59a377a71ffeb553376b1c60a80e/sys/netinet/sctp_uio.h#L110-L146

(apply <rust-lang#4062> to `main`)
(cherry picked from commit d63be8b)

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -1153,7 +1153,7 @@ s! {
         pub sinfo_assoc_id: ::sctp_assoc_t,
         pub sinfo_keynumber: u16,
         pub sinfo_keynumber_valid: u16,
-        pub __reserve_pad: [[u8; 23]; 4],
+        pub __reserve_pad: [u8; SCTP_ALIGN_RESV_PAD],
     }
 
     pub struct sctp_extrcvinfo {
@@ -1173,7 +1173,7 @@ s! {
         pub serinfo_next_ppid: u32,
         pub sinfo_keynumber: u16,
         pub sinfo_keynumber_valid: u16,
-        pub __reserve_pad: [[u8; 19]; 4],
+        pub __reserve_pad: [u8; SCTP_ALIGN_RESV_PAD_SHORT],
     }
 
     pub struct sctp_sndinfo {
@@ -4881,6 +4881,11 @@ pub const SCTP_ASSOC_RESET_FAILED: ::c_int = 0x0008;
 pub const SCTP_STREAM_CHANGE_DENIED: ::c_int = 0x0004;
 pub const SCTP_STREAM_CHANGE_FAILED: ::c_int = 0x0008;
 
+// sctp_uio.h
+
+pub const SCTP_ALIGN_RESV_PAD: usize = 92;
+pub const SCTP_ALIGN_RESV_PAD_SHORT: usize = 76;
+
 pub const KENV_DUMP_LOADER: ::c_int = 4;
 pub const KENV_DUMP_STATIC: ::c_int = 5;
 

src/unix/bsd/netbsdlike/netbsd/mod.rs

@@ -512,7 +512,7 @@ s! {
 
     pub struct accept_filter_arg {
         pub af_name: [::c_char; 16],
-        af_arg: [[::c_char; 10]; 24],
+        pub af_arg: [::c_char; 256 - 16],
     }
 
     pub struct ki_sigset_t {