Clean up libjingle.gyp and remove references to libpeer_target_type.

Clean up libjingle.gyp and remove references to libpeer_target_type.
This variable isn't supported any longer.

BUG=446865
Committed: https://crrev.com/fd22585c501bdd46f0a511fa5346fc9be1b85f88
Cr-Commit-Position: refs/heads/master@{#321371}

[tommi (sloooow) - chröme, 2015-03-13 22:45:01]

tommi@chromium.org changed reviewers:
+ kjellander@chromium.org

[kjellander_chromium, 2015-03-14 21:24:32]

lgtm

[tommi (sloooow) - chröme, 2015-03-19 13:49:42]

The CQ bit was checked by tommi@chromium.org

[commit-bot: I haz the power, 2015-03-19 13:49:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1008023002/1

[commit-bot: I haz the power, 2015-03-19 16:33:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-19 16:33:58]

Patchset 1 (id:??) landed as
https://crrev.com/fd22585c501bdd46f0a511fa5346fc9be1b85f88
Cr-Commit-Position: refs/heads/master@{#321371}

[tommi (sloooow) - chröme, 2015-03-20 19:27:32]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1025003002/ by tommi@chromium.org.

The reason for reverting is: See if this caused errors on Android. .