Auto merge of #1612 - GrayJack:fix_utmpx_debug_solarish, r=gnzlbg

Solarish: Fix utmx Debug impl and re-add support for extra traits

Fix a bug where the compilation failed cause `utmpx.host` is bigger than 32 so we cannot print it.

Due to a break of compilation (only with extra trait enabled) on a Tier 2 platform, I do think it would be better to do another release as soon as proven fixing compilation

Author: bors

src/unix/solarish/mod.rs

@@ -479,16 +479,19 @@ s_no_extra_traits! {
         __sigev_pad2: ::c_int,
     }
 
+    #[cfg_attr(feature = "extra_traits", allow(missing_debug_implementations))]
     pub union door_desc_t__d_data {
         pub d_desc: door_desc_t__d_data__d_desc,
         d_resv: [::c_int; 5], /* Check out /usr/include/sys/door.h */
     }
 
+    #[cfg_attr(feature = "extra_traits", allow(missing_debug_implementations))]
     pub struct door_desc_t {
         pub d_attributes: door_attr_t,
         pub d_data: door_desc_t__d_data,
     }
 
+    #[cfg_attr(feature = "extra_traits", allow(missing_debug_implementations))]
     pub struct door_arg_t {
         pub data_ptr: *const ::c_char,
         pub data_size: ::size_t,
@@ -536,7 +539,7 @@ cfg_if! {
                     .field("ut_session", &self.ut_session)
                     .field("ut_pad", &self.ut_pad)
                     .field("ut_syslen", &self.ut_syslen)
-                    .field("ut_host", &self.ut_host)
+                    .field("ut_host", &&self.ut_host[..])
                     .finish()
             }
         }