Avoid use of LFS64 symbols on Emscripten

Since Emscripten uses musl libc internally.

Non-functional change: all LFS64 symbols were aliased to their non-LFS64
counterparts in rust-lang/libc@7c952dc.

Author: kleisauke

library/std/src/os/emscripten/fs.rs

@@ -63,7 +63,7 @@ pub trait MetadataExt {
 impl MetadataExt for Metadata {
     #[allow(deprecated)]
     fn as_raw_stat(&self) -> &raw::stat {
-        unsafe { &*(self.as_inner().as_inner() as *const libc::stat64 as *const raw::stat) }
+        unsafe { &*(self.as_inner().as_inner() as *const libc::stat as *const raw::stat) }
     }
     fn st_dev(&self) -> u64 {
         self.as_inner().as_inner().st_dev as u64

library/std/src/os/emscripten/raw.rs

@@ -1,6 +1,4 @@
 //! Emscripten-specific raw type definitions
-//! This is basically exactly the same as the linux definitions,
-//! except using the musl-specific stat64 structure in liblibc.
 
 #![stable(feature = "raw_ext", since = "1.1.0")]
 #![deprecated(

library/std/src/sys/pal/unix/fd.rs

@@ -5,7 +5,6 @@ mod tests;
 
 #[cfg(not(any(
     target_os = "linux",
-    target_os = "emscripten",
     target_os = "l4re",
     target_os = "android",
     target_os = "hurd",
@@ -14,7 +13,6 @@ use libc::off_t as off64_t;
 #[cfg(any(
     target_os = "android",
     target_os = "linux",
-    target_os = "emscripten",
     target_os = "l4re",
     target_os = "hurd",
 ))]

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

@@ -29,12 +29,12 @@ use libc::fstatat64;
     target_os = "nto",
     target_os = "vita",
     all(target_os = "linux", target_env = "musl"),
+    target_os = "emscripten",
 ))]
 use libc::readdir as readdir64;
 #[cfg(not(any(
     target_os = "android",
     target_os = "linux",
-    target_os = "emscripten",
     target_os = "solaris",
     target_os = "illumos",
     target_os = "l4re",
@@ -48,7 +48,7 @@ use libc::readdir as readdir64;
 use libc::readdir_r as readdir64_r;
 #[cfg(any(all(target_os = "linux", not(target_env = "musl")), target_os = "hurd"))]
 use libc::readdir64;
-#[cfg(any(target_os = "emscripten", target_os = "l4re"))]
+#[cfg(target_os = "l4re")]
 use libc::readdir64_r;
 use libc::{c_int, mode_t};
 #[cfg(target_os = "android")]
@@ -58,7 +58,6 @@ use libc::{
 };
 #[cfg(not(any(
     all(target_os = "linux", not(target_env = "musl")),
-    target_os = "emscripten",
     target_os = "l4re",
     target_os = "android",
     target_os = "hurd",
@@ -69,7 +68,6 @@ use libc::{
 };
 #[cfg(any(
     all(target_os = "linux", not(target_env = "musl")),
-    target_os = "emscripten",
     target_os = "l4re",
     target_os = "hurd"
 ))]