Reorder EPOLL flag constants

Put them in ascending order, which matches the order Linux defines them.

Author: rtzoeller

src/unix/linux_like/mod.rs

@@ -1028,13 +1028,13 @@ pub const FD_SETSIZE: usize = 1024;
 pub const EPOLLIN: ::c_int = 0x1;
 pub const EPOLLPRI: ::c_int = 0x2;
 pub const EPOLLOUT: ::c_int = 0x4;
+pub const EPOLLERR: ::c_int = 0x8;
+pub const EPOLLHUP: ::c_int = 0x10;
 pub const EPOLLRDNORM: ::c_int = 0x40;
 pub const EPOLLRDBAND: ::c_int = 0x80;
 pub const EPOLLWRNORM: ::c_int = 0x100;
 pub const EPOLLWRBAND: ::c_int = 0x200;
 pub const EPOLLMSG: ::c_int = 0x400;
-pub const EPOLLERR: ::c_int = 0x8;
-pub const EPOLLHUP: ::c_int = 0x10;
 pub const EPOLLET: ::c_int = 0x80000000;
 
 pub const EPOLL_CTL_ADD: ::c_int = 1;