添加accept4 (#16)

src/platform/x86_64/nr.rs

@@ -79,7 +79,7 @@ pub const SYS_GET_DENTS_64: usize = 217;
 pub const SYS_SET_TID_ADDR: usize = 218;
 
 pub const SYS_UNLINK_AT: usize = 263;
-
+pub const SYS_ACCEPT4: usize = 288;
 pub const SYS_PIPE: usize = 293;
 
 pub const SYS_GET_RANDOM: usize = 318;