Fix build on non-Unix platforms

src/libstd/sys/cloudabi/thread.rs

@@ -118,6 +118,7 @@ pub mod guard {
     pub unsafe fn init() -> Option<Guard> {
         None
     }
+    pub unsafe fn deinit() {}
 }
 
 fn min_stack_size(_: *const libc::pthread_attr_t) -> usize {

src/libstd/sys/redox/thread.rs

@@ -91,4 +91,5 @@ pub mod guard {
     pub type Guard = !;
     pub unsafe fn current() -> Option<Guard> { None }
     pub unsafe fn init() -> Option<Guard> { None }
+    pub unsafe fn deinit() {}
 }

src/libstd/sys/unix/thread.rs

@@ -209,6 +209,7 @@ pub mod guard {
     pub type Guard = Range<usize>;
     pub unsafe fn current() -> Option<Guard> { None }
     pub unsafe fn init() -> Option<Guard> { None }
+    pub unsafe fn deinit() {}
 }
 
 

src/libstd/sys/wasm/thread.rs

@@ -46,4 +46,5 @@ pub mod guard {
     pub type Guard = !;
     pub unsafe fn current() -> Option<Guard> { None }
     pub unsafe fn init() -> Option<Guard> { None }
+    pub unsafe fn deinit() {}
 }

src/libstd/sys/windows/thread.rs

@@ -96,4 +96,5 @@ pub mod guard {
     pub type Guard = !;
     pub unsafe fn current() -> Option<Guard> { None }
     pub unsafe fn init() -> Option<Guard> { None }
+    pub unsafe fn deinit() {}
 }