Restore __futex_wake and __futex_wait for LP32.

Should fix Skype:

  java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "__futex_wake" referenced by "libsliq.so"...

Bug: 15196718
Change-Id: I8a18e18d830f0436e820cbde577121bd92710803
Merge "Restore __futex_wake and __futex_wait for LP32."
Restore tkill for LP32.

libmono from Unity still requires tkill(2).

Change-Id: I37a1994b08086c7fedb5c78ea0dadf2d72bc1463
Signed-off-by: Anthony King <anthonydking@slimroms.net>
Merge "Restore tkill for LP32."
auto-merger: merge in from aosp/master