Fix __libc_epoll_pwait compile failure on x86

Fix __libc_epoll_pwait compile failure on x86

This prevents "memory input 7 is not directly addressable" errors.

| libc/sysdeps/linux/common/epoll.c: In function '__libc_epoll_pwait':
| libc/sysdeps/linux/common/epoll.c:71:80: error: memory input 7 is not directly addressable
| libc/sysdeps/linux/common/epoll.c:75:86: error: memory input 7 is not directly addressable
| make: *** [libc/sysdeps/linux/common/epoll.o] Error 1
| make: *** Waiting for unfinished jobs....

Signed-off-by: Phil Blundell <pb@pbcl.net>
Signed-off-by: Jason Woodward <jason.woodward@timesys.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>