musl: struct ipc_perm: rename __ipc_perm_key to __key

This isn't strictly related to musl 1.2.3, however now presents a good
time to change it, before the 1.0 release.

(backport <rust-lang#4443>)
(cherry picked from commit 3f81aad)

Author: xbjfk

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

@@ -55,6 +55,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,

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

@@ -34,6 +34,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release"
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,

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

@@ -57,6 +57,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,

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

@@ -53,6 +53,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,

src/unix/linux_like/linux/musl/b32/x86/mod.rs

@@ -59,6 +59,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,

src/unix/linux_like/linux/musl/b64/aarch64/mod.rs

@@ -60,6 +60,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,

src/unix/linux_like/linux/musl/b64/mips64.rs

@@ -57,6 +57,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,

src/unix/linux_like/linux/musl/b64/powerpc64.rs

@@ -51,6 +51,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,

src/unix/linux_like/linux/musl/b64/s390x.rs

@@ -10,6 +10,14 @@ pub type __s64 = i64;
 
 s! {
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,

src/unix/linux_like/linux/musl/b64/wasm32/mod.rs

@@ -53,6 +53,14 @@ s! {
     }
 
     pub struct ipc_perm {
+        #[cfg(musl_v1_2_3)]
+        pub __key: crate::key_t,
+        #[cfg(not(musl_v1_2_3))]
+        #[deprecated(
+            since = "0.2.173",
+            note = "This field is incorrectly named and will be changed
+                to __key in a future release."
+        )]
         pub __ipc_perm_key: crate::key_t,
         pub uid: crate::uid_t,
         pub gid: crate::gid_t,