android: add a switch to handle Android L

restore support of wait3()
librpc: inet_makeaddr() is now in bionic

nslookup modified (_res is now hidden in libc dns)
tested on kitkat and built on l-preview

Note:
 With static version built on l-preview,
 nslookup doesnt work on kitkat due to a new socket flag
 named SOCK_CLOEXEC (0x80000), bacon kernel could be
 incompatible with this socket option (to check) or
 dnsproxyd could be not compatible.

 To be tested on a real Android 5.0 build later...

Change-Id: I109bcb6764e84c14c7fc890a6014326238fdf26f
Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>