Add Elf 32 Support to Courgette.

Add Elf 32 Support to Courgette.

This change takes advantage of recent refactoring and adds support for
Elf X86 32 executables to courgette. It should have no effect on handling
of Windows PE executables.

We have planned ahead to be able to restrict the code size of the courgette
library in different cases to reduce patcher sizes, but this change does
not yet take advantage of that (all platforms are supported everywhere).

Also, the patcher class currently contains a very small amount of Elf/PE
specific code for recreating relocation tables that cannot (currently) be
compiled out.

BUG=chromium-os:22149
TEST=Please verify that Chrome/Chromium patches can still be generated and
work.
Also, please see how much the updater executable which is downloaded to
users has changed in size since R16.


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=109089

[dgarrett, 2011-11-08 01:49:55]

The previous version of this was reverted because it failed to build on 32 bit
linux.

The previous version was reviewed, and the change here is trivial. Repushing.

[commit-bot: I haz the power, 2011-11-08 01:50:11]

No LGTM from valid reviewers yet.

[dgarrett, 2011-11-08 01:50:27]

LGTM

[commit-bot: I haz the power, 2011-11-08 01:50:38]

No LGTM from valid reviewers yet.

[commit-bot: I haz the power, 2011-11-08 01:51:08]

No LGTM from valid reviewers yet.

[dgarrett, 2011-11-08 01:58:11]

Or I won't push it directly.

I have built this code for Linux 32 without further errors. This took longer to
arrange than it should have.

The second upload shows the fix. I would appreciate an LGTM as appropriate.

[sra1, 2011-11-08 03:59:33]

lgtm

[commit-bot: I haz the power, 2011-11-08 18:34:34]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dgarrett@chromium.org/8477045/2001

[commit-bot: I haz the power, 2011-11-08 20:32:28]

Change committed as 109089