[NaCl SDK] Remove old .gitignore file

[NaCl SDK] Remove old .gitignore file

The contents of this file seems to be all legacy
stuff.  These days all the build products end up in
the 'out' directory.

Committed: https://crrev.com/b6ce4bf33b84b77439ed883be33a1bf0db4b7a58
Cr-Commit-Position: refs/heads/master@{#311367}

[Sam Clegg, 2015-01-13 22:15:18]

sbc@chromium.org changed reviewers:
+ binji@chromium.org

[binji, 2015-01-13 23:58:17]

lgtm

[Sam Clegg, 2015-01-14 00:00:56]

The CQ bit was checked by sbc@chromium.org

[commit-bot: I haz the power, 2015-01-14 00:01:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/835233004/1

[commit-bot: I haz the power, 2015-01-14 00:13:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-14 00:13:45]

Patchset 1 (id:??) landed as
https://crrev.com/b6ce4bf33b84b77439ed883be33a1bf0db4b7a58
Cr-Commit-Position: refs/heads/master@{#311367}