Revert of Don't link with audio codecs that we don't use

Revert of Don't link with audio codecs that we don't use (patchset #4 id:60001 of https://codereview.webrtc.org/1349393003/ )

Reason for revert:
Breaking Chromium FYI bots.

Original issue's description:
> Don't link with audio codecs that we don't use
>
> We used to link with all audio codecs unconditionally (except Opus);
> this patch makes gyp and gn only link to the ones that are used.
>
> (This unfortunately fails to have a measurable impact on Chromium
> binary size, at least on x86_64 Linux; it turns out that iLBC and iSAC
> fix were already being excluded from Chromium by some other means
> (likely just the linker omitting compilation units with no incoming
> references).)
>
> BUG=webrtc:4557
>
> Committed: https://crrev.com/f66a9251424351ea6d631c54dd1feb64cc13d809
> Cr-Commit-Position: refs/heads/master@{#10046}

TBR=henrik.lundin@webrtc.org,tina.legrand@webrtc.org,kjellander@webrtc.org,kwiberg@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:4557
Committed: https://crrev.com/3fd7be4cb1d41ff6298a90c17acf52d379ab8812
Cr-Commit-Position: refs/heads/master@{#10069}

[the sun, 2015-09-25 08:35:39]

Created Revert of Don't link with audio codecs that we don't use

[commit-bot: I haz the power, 2015-09-25 08:35:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1368933002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1368933002/1

[commit-bot: I haz the power, 2015-09-25 08:36:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-25 08:36:18]

Patchset 1 (id:??) landed as
https://crrev.com/3fd7be4cb1d41ff6298a90c17acf52d379ab8812
Cr-Commit-Position: refs/heads/master@{#10069}

[kwiberg-webrtc, 2015-09-25 09:31:24]

On 2015/09/25 08:36:18, commit-bot: I haz the power wrote:
> Patchset 1 (id:??) landed as
> https://crrev.com/3fd7be4cb1d41ff6298a90c17acf52d379ab8812
> Cr-Commit-Position: refs/heads/master@{#10069}

lgtm