* xlat/epollevents.in: Provide fallback definitions, add EPOLLNVAL
constant (introduced by Linux commit v4.16-rc1~3^2~3).
-EPOLLIN
-EPOLLPRI
-EPOLLOUT
-EPOLLRDNORM
-EPOLLRDBAND
-EPOLLWRNORM
-EPOLLWRBAND
-EPOLLMSG
-EPOLLERR
-EPOLLHUP
-EPOLLRDHUP
-EPOLLEXCLUSIVE
-EPOLLWAKEUP
-EPOLLONESHOT
-EPOLLET
+EPOLLIN 0x00000001
+EPOLLPRI 0x00000002
+EPOLLOUT 0x00000004
+EPOLLERR 0x00000008
+EPOLLHUP 0x00000010
+EPOLLNVAL 0x00000020
+EPOLLRDNORM 0x00000040
+EPOLLRDBAND 0x00000080
+EPOLLWRNORM 0x00000100
+EPOLLWRBAND 0x00000200
+EPOLLMSG 0x00000400
+EPOLLRDHUP 0x00002000
+EPOLLEXCLUSIVE 0x10000000
+EPOLLWAKEUP 0x20000000
+EPOLLONESHOT 0x40000000
+EPOLLET 0x80000000