Format libstd/sys with rustfmt

This commit applies rustfmt with rust-lang/rust's default settings to
files in src/libstd/sys *that are not involved in any currently open PR*
to minimize merge conflicts. THe list of files involved in open PRs was
determined by querying GitHub's GraphQL API with this script:
https://gist.github.com/dtolnay/aa9c34993dc051a4f344d1b10e4487e8

With the list of files from the script in outstanding_files, the
relevant commands were:

    $ find src/libstd/sys -name '*.rs' \
        | xargs rustfmt --edition=2018 --unstable-features --skip-children
    $ rg libstd/sys outstanding_files | xargs git checkout --

Repeating this process several months apart should get us coverage of
most of the rest of the files.

To confirm no funny business:

    $ git checkout $THIS_COMMIT^
    $ git show --pretty= --name-only $THIS_COMMIT \
        | xargs rustfmt --edition=2018 --unstable-features --skip-children
    $ git diff $THIS_COMMIT  # there should be no difference

1 files changed, 10 insertions, 4 deletions

diff --git a/src/libstd/sys/sgx/stdio.rs b/src/libstd/sys/sgx/stdio.rs
index a575401f5f6..716c174bd53 100644
--- a/src/libstd/sys/sgx/stdio.rs
+++ b/src/libstd/sys/sgx/stdio.rs
@@ -1,11 +1,11 @@
 use fortanix_sgx_abi as abi;
 
 use crate::io;
-use crate::sys::fd::FileDesc;
 #[cfg(not(test))]
 use crate::slice;
 #[cfg(not(test))]
 use crate::str;
+use crate::sys::fd::FileDesc;
 
 pub struct Stdin(());
 pub struct Stdout(());
@@ -19,7 +19,9 @@ fn with_std_fd<F: FnOnce(&FileDesc) -> R, R>(fd: abi::Fd, f: F) -> R {
 }
 
 impl Stdin {
-    pub fn new() -> io::Result<Stdin> { Ok(Stdin(())) }
+    pub fn new() -> io::Result<Stdin> {
+        Ok(Stdin(()))
+    }
 }
 
 impl io::Read for Stdin {
@@ -29,7 +31,9 @@ impl io::Read for Stdin {
 }
 
 impl Stdout {
-    pub fn new() -> io::Result<Stdout> { Ok(Stdout(())) }
+    pub fn new() -> io::Result<Stdout> {
+        Ok(Stdout(()))
+    }
 }
 
 impl io::Write for Stdout {
@@ -43,7 +47,9 @@ impl io::Write for Stdout {
 }
 
 impl Stderr {
-    pub fn new() -> io::Result<Stderr> { Ok(Stderr(())) }
+    pub fn new() -> io::Result<Stderr> {
+        Ok(Stderr(()))
+    }
 }
 
 impl io::Write for Stderr {