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, 2 insertions, 6 deletions

diff --git a/src/libstd/sys/wasm/args.rs b/src/libstd/sys/wasm/args.rs
index 8279e5280e9..3b6557ae325 100644
--- a/src/libstd/sys/wasm/args.rs
+++ b/src/libstd/sys/wasm/args.rs
@@ -6,14 +6,10 @@ pub unsafe fn init(_argc: isize, _argv: *const *const u8) {
     // On wasm these should always be null, so there's nothing for us to do here
 }
 
-pub unsafe fn cleanup() {
-}
+pub unsafe fn cleanup() {}
 
 pub fn args() -> Args {
-    Args {
-        iter: Vec::new().into_iter(),
-        _dont_send_or_sync_me: PhantomData,
-    }
+    Args { iter: Vec::new().into_iter(), _dont_send_or_sync_me: PhantomData }
 }
 
 pub struct Args {