Revert "Compile and link libcrypto_nacl for nacl targets."

Revert "Compile and link libcrypto_nacl for nacl targets."

I restructured the new ipc attachment broker code to not expose any crypto
symbols to irt targets, so the original CL is no longer needed.

> NaCl depends on libipc_nacl, which recently started depending on libcrypto_nacl.
> I failed to update the NaCl build files appropriately.
>
> BUG=466437
> Committed: https://crrev.com/675c4a0b28eb5b8e922153af2feb1ff68b635eb7
> Cr-Commit-Position: refs/heads/master@{#339558}

BUG=466437
TBR=agl@chromium.org, mseaborn@chromium.org

Committed: https://crrev.com/3e4cf54491803eb102c4887f1de5ccd088c612b1
Cr-Commit-Position: refs/heads/master@{#340622}

[erikchen, 2015-07-27 20:53:43]

The CQ bit was checked by erikchen@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-07-27 20:54:58]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1259103002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1259103002/1

[commit-bot: I haz the power, 2015-07-27 22:32:18]

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

[commit-bot: I haz the power, 2015-07-27 22:32:19]

Dry run: This issue passed the CQ dry run.

[erikchen, 2015-07-28 00:59:01]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2015-07-28 00:59:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1259103002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1259103002/1

[commit-bot: I haz the power, 2015-07-28 01:04:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-28 01:04:59]

Patchset 1 (id:??) landed as
https://crrev.com/3e4cf54491803eb102c4887f1de5ccd088c612b1
Cr-Commit-Position: refs/heads/master@{#340622}

[Mark Seaborn, 2015-07-28 21:12:00]

BTW, this change says "TBR=mseaborn", but there's no-one in the Reviewers and CC
fields, so I didn't get an e-mail about this.

LGTM though. :-)