Fix relocation packing in GN

Fix relocation packing in GN

In GN we pass multiple lists of libraries to the relocation packing
script. But, when that script doesn't support that, it just makes the
later ones override the earlier ones. Now, it will append all the lists.

NOTRY=true
BUG=359249
Committed: https://crrev.com/09ac0842aa0603f504d8877b015dc3d04a0b928f
Cr-Commit-Position: refs/heads/master@{#301184}

[cjhopman, 2014-10-24 18:32:32]

Patchset #1 (id:1) has been deleted

[cjhopman, 2014-10-24 19:59:07]

cjhopman@chromium.org changed reviewers:
+ newt@chromium.org

[cjhopman, 2014-10-24 19:59:08]

newt: *

[cjhopman, 2014-10-24 20:02:56]

cjhopman@chromium.org changed reviewers:
+ nyquist@chromium.org
- newt@chromium.org

[cjhopman, 2014-10-24 20:02:56]

nyquist: *

[nyquist, 2014-10-24 20:05:52]

lgtm

[cjhopman, 2014-10-24 20:14:25]

The CQ bit was checked by cjhopman@chromium.org

[commit-bot: I haz the power, 2014-10-24 20:15:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/675263002/20001

[commit-bot: I haz the power, 2014-10-24 20:17:07]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2014-10-24 20:17:56]

Patchset 1 (id:??) landed as
https://crrev.com/09ac0842aa0603f504d8877b015dc3d04a0b928f
Cr-Commit-Position: refs/heads/master@{#301184}