Change visibility of Args new function

Currently the Args new function is scope constrained to pub(super) but this stops me from being able to construct Args structs in unit tests.

Author: chotchki

library/std/src/sys/args/common.rs

@@ -12,7 +12,7 @@ impl !Sync for Args {}
 
 impl Args {
     #[inline]
-    pub(super) fn new(args: Vec<OsString>) -> Self {
+    pub fn new(args: Vec<OsString>) -> Self {
         Args { iter: args.into_iter() }
     }
 }