Fix build on i686-apple-darwin systems

Replace `target_arch = "x86_64"` with `not(target_arch = "aarch64")` so that i686-apple-darwin systems dynamically choose implementation.

Author: MarcusCalhoun-Lopez

library/std/src/sys/unix/fs.rs

@@ -1535,12 +1535,12 @@ mod remove_dir_impl {
     use crate::sync::Arc;
     use crate::sys::{cvt, cvt_r};
 
-    #[cfg(not(all(target_os = "macos", target_arch = "x86_64"),))]
+    #[cfg(not(all(target_os = "macos", not(target_arch = "aarch64")),))]
     use libc::{fdopendir, openat, unlinkat};
-    #[cfg(all(target_os = "macos", target_arch = "x86_64"))]
+    #[cfg(all(target_os = "macos", not(target_arch = "aarch64")))]
     use macos_weak::{fdopendir, openat, unlinkat};
 
-    #[cfg(all(target_os = "macos", target_arch = "x86_64"))]
+    #[cfg(all(target_os = "macos", not(target_arch = "aarch64")))]
     mod macos_weak {
         use crate::sys::weak::weak;
         use libc::{c_char, c_int, DIR};
@@ -1699,12 +1699,12 @@ mod remove_dir_impl {
         }
     }
 
-    #[cfg(not(all(target_os = "macos", target_arch = "x86_64")))]
+    #[cfg(not(all(target_os = "macos", not(target_arch = "aarch64"))))]
     pub fn remove_dir_all(p: &Path) -> io::Result<()> {
         remove_dir_all_modern(p)
     }
 
-    #[cfg(all(target_os = "macos", target_arch = "x86_64"))]
+    #[cfg(all(target_os = "macos", not(target_arch = "aarch64")))]
     pub fn remove_dir_all(p: &Path) -> io::Result<()> {
         if macos_weak::has_openat() {
             // openat() is available with macOS 10.10+, just like unlinkat() and fdopendir()