Revert of Default-enable external startup data for Linux for stand-alone builds.

Revert of Default-enable external startup data for Linux for stand-alone builds. (patchset #1 id:1 of https://codereview.chromium.org/956373002/)

Reason for revert:
The CL caused two issues:
- a weird build issue on V8 mips builder
- d8 cannot be invoked via PATH, since then it doesn't find its external snapshot.

The 2nd issue might even be WAI, but this needs more consideration.

Original issue's description:
> Default-enable external startup data for Linux for stand-alone builds.
>
> Notes:
> - Other platforms to follow later.
> - This follows Chromium practice, that mostly uses this feature these days.
> - The statically linked-in startup data will stay. So whoever prefers
>   the old way just needs to set the flag differently.
>
> Reland crrev.com/959693002, once crrev.com/960883003 is in.
>
> R=machenbach@chromium.org
> BUG=
>
> Committed: https://crrev.com/a0bdb103b676b4c7fa6b9f2e7149e716549c05d1
> Cr-Commit-Position: refs/heads/master@{#26980}

TBR=machenbach@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/45ce8047822c76775b66be769856fd407d614023
Cr-Commit-Position: refs/heads/master@{#26986}

[vogelheim, 2015-03-04 13:52:07]

Created Revert of Default-enable external startup data for Linux for stand-alone
builds.

[commit-bot: I haz the power, 2015-03-04 13:53:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/981463005/1

[commit-bot: I haz the power, 2015-03-04 13:53:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-04 13:53:31]

Patchset 1 (id:??) landed as
https://crrev.com/45ce8047822c76775b66be769856fd407d614023
Cr-Commit-Position: refs/heads/master@{#26986}