Note known failures for TCP_USER_TIMEOUT tests on host

TCP_USER_TIMEOUT is not currently defined on the prebuilt tcp.h (at least
not on x86-64), so its value at the non-native level remains 0, breaking
tests that rely on it.

Devices kernels and bionic support it, therefore these tests are only
expected to break on host.

Test: Nothing. Buildbot will let us know soon enough if the expected
      failures do not match reality.

Bug: 30402085
Change-Id: Iacaf63ab341c6e4a41c7d21fb3064d58ada94800
1 file changed