Fix compile errors for ARM.

Author: vadimcn

src/libstd/rt/libunwind.rs

@@ -36,6 +36,7 @@ pub enum _Unwind_Action {
 
 #[cfg(target_arch = "arm")]
 #[repr(C)]
+#[derive(Copy, Clone)]
 pub enum _Unwind_State {
     _US_VIRTUAL_UNWIND_FRAME = 0,
     _US_UNWIND_FRAME_STARTING = 1,
@@ -46,6 +47,7 @@ pub enum _Unwind_State {
 }
 
 #[repr(C)]
+#[derive(Copy, Clone)]
 pub enum _Unwind_Reason_Code {
     _URC_NO_REASON = 0,
     _URC_FOREIGN_EXCEPTION_CAUGHT = 1,

src/libstd/rt/unwind/gcc.rs

@@ -179,8 +179,8 @@ pub mod eabi {
         }
         else { // cleanup phase
             unsafe {
-                __gcc_personality_sj0(_version, actions, _exception_class, _ue_header,
-                                      _context)
+                __gcc_personality_sj0(version, actions, exception_class, ue_header,
+                                      context)
             }
         }
     }