Fix pnacl_support_extension null build on linux/mac (no longer have libgcc_eh.a).

Fix pnacl_support_extension null build on linux/mac (no longer have libgcc_eh.a).

The libgcc_eh.a file is no longer in the translator tarball
possibly after NaCl revision:

1fceb45: (dschuff) Wrap PNaCl sandboxed translator build in toolchain_build recipe

Cr-Commit-Position: refs/heads/master@{#312891}, fixed
this for windows builds, but not linux / mac.

Committed: https://crrev.com/37489c3ca46109c75690825910333192b15f32e3
Cr-Commit-Position: refs/heads/master@{#313192}

[jvoung (off chromium), 2015-01-27 00:42:33]

jvoung@chromium.org changed reviewers:
+ bradnelson@chromium.org, dschuff@chromium.org

[Derek Schuff, 2015-01-27 01:09:23]

lgtm

[jvoung (off chromium), 2015-01-27 01:14:36]

The CQ bit was checked by jvoung@chromium.org

[commit-bot: I haz the power, 2015-01-27 01:15:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/879803002/1

[commit-bot: I haz the power, 2015-01-27 01:29:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-27 01:32:18]

Patchset 1 (id:??) landed as
https://crrev.com/37489c3ca46109c75690825910333192b15f32e3
Cr-Commit-Position: refs/heads/master@{#313192}