fixed the missing crate issue.

CoAuthored by : Bradley Landherr <https://github.com/landhb>

Author: ItshMoh

src/unix/mod.rs

@@ -262,16 +262,16 @@ cfg_if! {
             }
         }
         impl Eq for __c_anonymous_sigaction_handler{}
-        impl ::fmt::Debug for __c_anonymous_sigaction_handler {
-            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result
+        impl fmt::Debug for __c_anonymous_sigaction_handler {
+            fn fmt(&self, f: &mut fmt::Formatter) -> ::fmt::Result
             {
                 f.debug_struct("sigaction_t")
                    .field("value", unsafe{ &self.default })
                    .finish()
             }
         }
-        impl ::hash::Hash for __c_anonymous_sigaction_handler {
-            fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
+        impl hash::Hash for __c_anonymous_sigaction_handler {
+            fn hash<H: hash::Hasher>(&self, state: &mut H) {
                 unsafe{ self.default.hash(state) };
             }
         }