remove posix_getdents() from musl

the musl bundled with rust appears to be from january 2024

Author: cosmicexplorer

libc-test/semver/linux-musl.txt

@@ -74,8 +74,6 @@ getutxline
 lio_listio
 ntptimeval
 open_wmemstream
-posix_dent
-posix_getdents
 posix_spawn_file_actions_addchdir_np
 posix_spawn_file_actions_addfchdir_np
 preadv2

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

@@ -37,17 +37,6 @@ cfg_if! {
     }
 }
 
-s_no_extra_traits! {
-    #[repr(C)]
-    pub struct posix_dent {
-        pub d_ino: ino_t,
-        pub d_off: off_t,
-        pub d_reclen: c_ushort,
-        pub d_type: c_uchar,
-        pub d_name: *mut c_char,
-    }
-}
-
 impl siginfo_t {
     pub unsafe fn si_addr(&self) -> *mut c_void {
         #[repr(C)]
@@ -987,8 +976,6 @@ extern "C" {
 }
 
 extern "C" {
-    pub fn posix_getdents(fd: c_int, buf: *mut c_void, len: usize, flags: c_int) -> isize;
-
     pub fn getdents(fd: c_int, buf: *mut crate::dirent, len: usize) -> c_int;
 }