Enable statx on musl-libc

Version 1.2.5 of musl-libc added support for the statx system call[1].

[1]: https://musl.libc.org/releases.html

(backport <#3976>)
(cherry picked from commit ef3c046)

Author: neuschaefer

src/unix/linux_like/mod.rs

@@ -234,7 +234,11 @@ cfg_if! {
 }
 
 cfg_if! {
-    if #[cfg(any(target_env = "gnu", target_os = "android"))] {
+    if #[cfg(any(
+        target_env = "gnu",
+        target_os = "android",
+        all(target_env = "musl", musl_v1_2_3)
+    ))] {
         s! {
             pub struct statx {
                 pub stx_mask: crate::__u32,
@@ -1663,7 +1667,11 @@ cfg_if! {
 }
 
 cfg_if! {
-    if #[cfg(any(target_env = "gnu", target_os = "android"))] {
+    if #[cfg(any(
+        target_env = "gnu",
+        target_os = "android",
+        all(target_env = "musl", musl_v1_2_3)
+    ))] {
         pub const AT_STATX_SYNC_TYPE: c_int = 0x6000;
         pub const AT_STATX_SYNC_AS_STAT: c_int = 0x0000;
         pub const AT_STATX_FORCE_SYNC: c_int = 0x2000;
@@ -2181,7 +2189,11 @@ cfg_if! {
 
 // The statx syscall, available on some libcs.
 cfg_if! {
-    if #[cfg(any(target_env = "gnu", target_os = "android"))] {
+    if #[cfg(any(
+        target_env = "gnu",
+        target_os = "android",
+        all(target_env = "musl", musl_v1_2_3)
+    ))] {
         extern "C" {
             pub fn statx(
                 dirfd: c_int,