Remove unecessary headers following NDK r10c update.

BUG=chromium:358831
R=primiano@chromium.org, rmcilroy@chromium.org

Review URL: https://breakpad.appspot.com/10694002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1394 4c0a9323-5329-0410-9bdc-e9ce6186880e
Revert "Remove unecessary headers following NDK r10c update."

This reverts r1394.
Reason for the revert: r1394 is breaking compatibility with previous
NDK (< r10c).

BUG=chromium:358831
R=rmcilroy@chromium.org

Review URL: https://breakpad.appspot.com/6754003

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1395 4c0a9323-5329-0410-9bdc-e9ce6186880e
Update breakpad to support Android NDK r10c

Prior to NDK r10c, Breakpad was privately backporting these system
headers. This change is now unforking and removing those headers and
using the ones from the NDK.
Rationale:
 - They are finally available in the NDK, so there is no need to keep
   maintaining a fork (which was necessary up until recently to support
   arm64).
 - These forked headers, as they are today, are not compatible with the
   latest NDK (i.e. this change is required to roll NDK r10c).
   The forked ucontext.h, being removed by this CL, depends on some
   transitional features which are not compatible with the NDK release
   being targeted here.

After this change, the NDK r10c is now required to build Breakpad on
Android. Note that NDK releases are backwards compatible and contain all
the previous API levels, so this change is NOT effectively enforcing to
build against any particular Android SDK.

Submitting this on behalf of fdegans@chromium.org

BUG=chromium:358831
R=mark@chromium.org, primiano@chromium.org, rmcilroy@chromium.org

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1396 4c0a9323-5329-0410-9bdc-e9ce6186880e