ignore SIGPIPES

During bugreports mostly, when adb goes away it leads to apps crashing
because their output stream got closed.
Let's just ignore it.

Bug: 6447319
Change-Id: I1b293ebef737014162edebd5fd9bf254345b2ce8
Merge tag 'android-4.2.2_r1' of https://android.googlesource.com/platform/external/iptables into 1.1

Android 4.2.2 release 1