Handle bionic's strerror_r in an ABI-compatible way.

Handle bionic's strerror_r in an ABI-compatible way.

The previous fix in r291050 fixed source compatibility but broke ABI
compatibility with older versions of bionic instead. Since older
versions of bionic only provide the POSIX version of strerror_r we
should instead make sure we always use that version.

BUG=

Committed: https://crrev.com/c35ed07fdef5741deb5a306ca838a80515399487
Cr-Commit-Position: refs/heads/master@{#293894}

[Torne, 2014-09-08 10:50:42]

torne@chromium.org changed reviewers:
+ brettw@chromium.org

[Torne, 2014-09-08 10:50:43]

Hi again Brett,

Looks like my previous change in https://codereview.chromium.org/491893002/ was
the wrong fix as it broke ABI compatibility. I've tested that this produces
binaries still compatible with older bionic versions.

[Torne, 2014-09-08 14:36:57]

torne@chromium.org changed reviewers:
+ primiano@chromium.org

[Primiano Tucci (use gerrit), 2014-09-08 15:58:03]

Hyperbolic LGTM (This source file has more corner cases than what allowed by
euclidean geometry, so I can't just simply LGTM)

Joking aside, Torne and I had a pretty long discussion on this and this looks to
me the right thing to do to keep backwards API and ABI compatibility on Android.

[brettw, 2014-09-08 19:58:13]

lgtm

[Torne, 2014-09-08 20:26:09]

The CQ bit was checked by torne@chromium.org

[commit-bot: I haz the power, 2014-09-08 20:28:40]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/torne@chromium.org/552753002/1

[commit-bot: I haz the power, 2014-09-09 04:31:00]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-09 04:31:00]

Exceeded time limit waiting for builds to trigger.

[Primiano Tucci (use gerrit), 2014-09-09 07:19:19]

The CQ bit was checked by primiano@chromium.org

[commit-bot: I haz the power, 2014-09-09 07:25:23]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/torne@chromium.org/552753002/1

[commit-bot: I haz the power, 2014-09-09 08:15:33]

Committed patchset #1 (id:1) as c7c1067368fb5ec88519e84edf030a9fe538cddf

[commit-bot: I haz the power, 2014-09-10 03:51:56]

Patchset 1 (id:??) landed as
https://crrev.com/c35ed07fdef5741deb5a306ca838a80515399487
Cr-Commit-Position: refs/heads/master@{#293894}