musl: add semid_ds and seminfo

Adds the semid_ds struct based upon arch/generic/bits/sem.h and adds the
seminfo struct based upon include/sys/sem.h.

Signed-off-by: Aster Boese <asterboese@mailbox.org>

Author: JustSoup312

src/unix/linux_like/linux/musl/b32/mod.rs

@@ -15,6 +15,22 @@ s! {
         __val: [c_ulong; 32],
     }
 
+    pub struct semid_ds {
+        pub sem_perm: crate::ipc_perm,
+        pub sem_otime: crate::time_t,
+        pub sem_ctime: crate::time_t,
+        #[cfg(target_endian = "little")]
+        pub sem_nsems: crate::c_ushort,
+        #[cfg(target_endian = "little")]
+        __sem_nsems_pad: crate::c_char,
+        #[cfg(target_endian = "big")]
+        __sem_nsems_pad: crate::c_char,
+        #[cfg(target_endian = "big")]
+        pub sem_nsems: crate::c_ushort,
+        __unused3: crate::c_long,
+        __unused4: crate::c_long,
+    }
+
     pub struct msghdr {
         pub msg_name: *mut c_void,
         pub msg_namelen: crate::socklen_t,

src/unix/linux_like/linux/musl/b64/mod.rs

@@ -34,6 +34,22 @@ s! {
         __pad2: c_ulong,
     }
 
+    pub struct semid_ds {
+        pub sem_perm: crate::ipc_perm,
+        pub sem_otime: crate::time_t,
+        pub sem_ctime: crate::time_t,
+        #[cfg(target_endian = "little")]
+        pub sem_nsems: crate::c_ushort,
+        #[cfg(target_endian = "little")]
+        __sem_nsems_pad: crate::c_char,
+        #[cfg(target_endian = "big")]
+        __sem_nsems_pad: crate::c_char,
+        #[cfg(target_endian = "big")]
+        pub sem_nsems: crate::c_ushort,
+        __unused3: crate::c_long,
+        __unused4: crate::c_long,
+    }
+
     pub struct msqid_ds {
         pub msg_perm: crate::ipc_perm,
         pub msg_stime: crate::time_t,

src/unix/linux_like/linux/musl/mod.rs

@@ -279,6 +279,19 @@ s! {
         pub ch_addralign: crate::Elf32_Word,
     }
 
+    pub struct seminfo {
+        pub semmap: c_int,
+        pub semmni: c_int,
+        pub semmns: c_int,
+        pub semmnu: c_int,
+        pub semmsl: c_int,
+        pub semopm: c_int,
+        pub semume: c_int,
+        pub semusz: c_int,
+        pub semvmx: c_int,
+        pub semaem: c_int,
+    }
+
     pub struct timex {
         pub modes: c_uint,
         pub offset: c_long,