Explicitly add python-numpy dependency to install-build-deps.

Explicitly add python-numpy dependency to install-build-deps.

The package python-opencv recently added to install-build-deps depends on the python-numpy package. However, on Ubuntu 12.*, the package manager doesn't know about this dependency, so python-opencv crashes without explicitly installing python-numpy.

So basically, this just explicitly lists a dependency that already was a dependency.

BUG=424345
Committed: https://crrev.com/f041a51d5b0fd89519aa0d5dc772d658723a29a6
Cr-Commit-Position: refs/heads/master@{#305214}

[mthiesse, 2014-11-20 18:15:24]

mthiesse@chromium.org changed reviewers:
+ flackr@chromium.org

[mthiesse, 2014-11-20 18:39:31]

mthiesse@chromium.org changed reviewers:
+ phajdan.jr@chromium.org

[mthiesse, 2014-11-20 18:39:31]

PTAL

[flackr, 2014-11-20 18:45:25]

lgtm

[Paweł Hajdan Jr., 2014-11-21 10:02:58]

LGTM

[mthiesse, 2014-11-21 13:43:08]

The CQ bit was checked by mthiesse@chromium.org

[commit-bot: I haz the power, 2014-11-21 13:44:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/744883002/1

[commit-bot: I haz the power, 2014-11-21 14:28:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-21 14:29:39]

Patchset 1 (id:??) landed as
https://crrev.com/f041a51d5b0fd89519aa0d5dc772d658723a29a6
Cr-Commit-Position: refs/heads/master@{#305214}