Remove workaround in <sys/epoll.h>.

Linux 4.12 has a better fix: https://lkml.org/lkml/2017/2/23/416 and
https://lkml.org/lkml/2017/2/23/417.

Bug: N/A
Test: builds
Change-Id: I9cbf0c60817332142c48297899062f1a25f2b082
diff --git a/libc/include/sys/epoll.h b/libc/include/sys/epoll.h
index 5e92fdc..fcdab43 100644
--- a/libc/include/sys/epoll.h
+++ b/libc/include/sys/epoll.h
@@ -34,29 +34,9 @@
 #include <signal.h> /* For sigset_t. */
 
 #include <linux/eventpoll.h>
-/* TODO: https://lkml.org/lkml/2017/2/23/416 has a better fix. */
-#undef EPOLLWAKEUP
-#undef EPOLLONESHOT
-#undef EPOLLET
 
 __BEGIN_DECLS
 
-/* TODO: remove once https://lkml.org/lkml/2017/2/23/417 is upstream. */
-#define EPOLLIN          0x00000001
-#define EPOLLPRI         0x00000002
-#define EPOLLOUT         0x00000004
-#define EPOLLERR         0x00000008
-#define EPOLLHUP         0x00000010
-#define EPOLLRDNORM      0x00000040
-#define EPOLLRDBAND      0x00000080
-#define EPOLLWRNORM      0x00000100
-#define EPOLLWRBAND      0x00000200
-#define EPOLLMSG         0x00000400
-#define EPOLLRDHUP       0x00002000
-#define EPOLLWAKEUP      0x20000000
-#define EPOLLONESHOT     0x40000000
-#define EPOLLET          0x80000000
-
 typedef union epoll_data {
   void* ptr;
   int fd;