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

Author: neuschaefer

ci/install-musl.sh

@@ -5,7 +5,7 @@
 
 set -eux
 
-musl_version=1.1.24
+musl_version=1.2.5
 musl="musl-${musl_version}"
 
 # Download, configure, build, and install musl:

src/unix/linux_like/mod.rs

@@ -1888,7 +1888,7 @@ 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", target_env = "musl"))] {
         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;