Remove conditional len_t as socklen_t is now defined for aarch64-linu…

…x-android

Fixes #73

src/socket.rs

@@ -32,14 +32,9 @@ impl Socket {
     }
 
     pub fn bind(&self, addr: &SocketAddr) -> io::Result<()> {
-        #[cfg(not(all(any(target_arch = "aarch64", target_arch = "x86_64"), target_os = "android")))]
-        use sys::c::socklen_t as len_t;
-        #[cfg(all(any(target_arch = "aarch64", target_arch = "x86_64"), target_os = "android"))]
-        use libc::c_int as len_t;
-
         let (addr, len) = addr2raw(addr);
         unsafe {
-            ::cvt(c::bind(self.inner.raw(), addr, len as len_t)).map(|_| ())
+            ::cvt(c::bind(self.inner.raw(), addr, len as c::socklen_t)).map(|_| ())
         }
     }