Remove x11 from libjingle_media

Remove x11 from libjingle_media

This generates incorrect -lX11 with use_x11=0 in our other build system,
which causes the standalone libjingle_media target to not build.
This patch should fix that. I could remove -lX11 completely, and
libjingle still links fine. So does Chrome if I do the corresponding
change there, so I think this change is safe to make.

BUG=None

Committed: https://crrev.com/0ab8ca83650899e50a42a9064aace2aaa5595c52
Cr-Commit-Position: refs/heads/master@{#9869}

[phoglund, 2015-09-03 14:17:50]

phoglund@webrtc.org changed reviewers:
+ jiayl@webrtc.org

[phoglund, 2015-09-04 12:28:59]

Jiayang: please take a look.

[jiayl2, 2015-09-04 20:37:59]

lgtm

[phoglund, 2015-09-07 07:15:02]

The CQ bit was checked by phoglund@webrtc.org

[commit-bot: I haz the power, 2015-09-07 07:15:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1306243013/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1306243013/20001

[commit-bot: I haz the power, 2015-09-07 08:14:39]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-07 08:14:45]

Patchset 2 (id:??) landed as
https://crrev.com/0ab8ca83650899e50a42a9064aace2aaa5595c52
Cr-Commit-Position: refs/heads/master@{#9869}