Auto merge of #889 - EdSchouten:cloudabi-time_t, r=alexcrichton

Add time_t for CloudABI.

Even though this data type is not used by libstd in any platform
independent code, one of the unit tests in src/libstd/time/mod.rs refers
to it. Instead of making that unit test more complicated, simply add
time_t, matching the type used by the C library.

Author: bors

src/cloudabi/mod.rs

@@ -4,6 +4,7 @@ pub type pthread_key_t = usize;
 pub type pthread_t = usize;
 pub type sa_family_t = u8;
 pub type socklen_t = usize;
+pub type time_t = i64;
 
 s! {
     pub struct addrinfo {