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, 11 insertions, 12 deletions

diff --git a/src/libstd/sys/windows/rand.rs b/src/libstd/sys/windows/rand.rs
index 993831bec18..87ea416bf67 100644
--- a/src/libstd/sys/windows/rand.rs
+++ b/src/libstd/sys/windows/rand.rs
@@ -5,13 +5,10 @@ use crate::sys::c;
 #[cfg(not(target_vendor = "uwp"))]
 pub fn hashmap_random_keys() -> (u64, u64) {
     let mut v = (0, 0);
-    let ret = unsafe {
-        c::RtlGenRandom(&mut v as *mut _ as *mut u8,
-                        mem::size_of_val(&v) as c::ULONG)
-    };
+    let ret =
+        unsafe { c::RtlGenRandom(&mut v as *mut _ as *mut u8, mem::size_of_val(&v) as c::ULONG) };
     if ret == 0 {
-        panic!("couldn't generate random bytes: {}",
-               io::Error::last_os_error());
+        panic!("couldn't generate random bytes: {}", io::Error::last_os_error());
     }
     v
 }
@@ -22,13 +19,15 @@ pub fn hashmap_random_keys() -> (u64, u64) {
 
     let mut v = (0, 0);
     let ret = unsafe {
-        c::BCryptGenRandom(ptr::null_mut(), &mut v as *mut _ as *mut u8,
-                           mem::size_of_val(&v) as c::ULONG,
-                           c::BCRYPT_USE_SYSTEM_PREFERRED_RNG)
+        c::BCryptGenRandom(
+            ptr::null_mut(),
+            &mut v as *mut _ as *mut u8,
+            mem::size_of_val(&v) as c::ULONG,
+            c::BCRYPT_USE_SYSTEM_PREFERRED_RNG,
+        )
     };
     if ret != 0 {
-        panic!("couldn't generate random bytes: {}",
-               io::Error::last_os_error());
+        panic!("couldn't generate random bytes: {}", io::Error::last_os_error());
     }
-    return v
+    return v;
 }