Format libstd/os with rustfmt

This commit applies rustfmt with rust-lang/rust's default settings to
files in src/libstd/os *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/os -name '*.rs' \
        | xargs rustfmt --edition=2018 --unstable-features --skip-children
    $ rg libstd/os 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, 23 insertions, 13 deletions

diff --git a/src/libstd/os/macos/raw.rs b/src/libstd/os/macos/raw.rs
index 5685642c07f..708261d86bd 100644
--- a/src/libstd/os/macos/raw.rs
+++ b/src/libstd/os/macos/raw.rs
@@ -1,23 +1,33 @@
 //! macOS-specific raw type definitions
 
 #![stable(feature = "raw_ext", since = "1.1.0")]
-#![rustc_deprecated(since = "1.8.0",
-                    reason = "these type aliases are no longer supported by \
-                              the standard library, the `libc` crate on \
-                              crates.io should be used instead for the correct \
-                              definitions")]
+#![rustc_deprecated(
+    since = "1.8.0",
+    reason = "these type aliases are no longer supported by \
+              the standard library, the `libc` crate on \
+              crates.io should be used instead for the correct \
+              definitions"
+)]
 #![allow(deprecated)]
 
 use crate::os::raw::c_long;
 
-#[stable(feature = "raw_ext", since = "1.1.0")] pub type blkcnt_t = u64;
-#[stable(feature = "raw_ext", since = "1.1.0")] pub type blksize_t = u64;
-#[stable(feature = "raw_ext", since = "1.1.0")] pub type dev_t = u64;
-#[stable(feature = "raw_ext", since = "1.1.0")] pub type ino_t = u64;
-#[stable(feature = "raw_ext", since = "1.1.0")] pub type mode_t = u32;
-#[stable(feature = "raw_ext", since = "1.1.0")] pub type nlink_t = u64;
-#[stable(feature = "raw_ext", since = "1.1.0")] pub type off_t = u64;
-#[stable(feature = "raw_ext", since = "1.1.0")] pub type time_t = i64;
+#[stable(feature = "raw_ext", since = "1.1.0")]
+pub type blkcnt_t = u64;
+#[stable(feature = "raw_ext", since = "1.1.0")]
+pub type blksize_t = u64;
+#[stable(feature = "raw_ext", since = "1.1.0")]
+pub type dev_t = u64;
+#[stable(feature = "raw_ext", since = "1.1.0")]
+pub type ino_t = u64;
+#[stable(feature = "raw_ext", since = "1.1.0")]
+pub type mode_t = u32;
+#[stable(feature = "raw_ext", since = "1.1.0")]
+pub type nlink_t = u64;
+#[stable(feature = "raw_ext", since = "1.1.0")]
+pub type off_t = u64;
+#[stable(feature = "raw_ext", since = "1.1.0")]
+pub type time_t = i64;
 
 #[stable(feature = "pthread_t", since = "1.8.0")]
 pub type pthread_t = usize;