Update buildtools dependeny to 5dd147a93316

[sebastian]

Background

We haven't updated the "buildtools" submodule in a while. So we should do for the 1.8.8 release, pulling in following changes:

#140

[Remove timeline code] Remove timeline-specific build hacks

#170

Replacing Mercurial subrepositories

#1321

Build tools should truncate extension name for Chrome extensions to 45 characters

#1358

Publish build tools under the MPL 2.0 license

#1360

Add dependencies file for buildtools repository

#1363

Make sure source code archives created by release automation consider the new dependencies mechanism

#1366

ensure_dependencies.py checkout fails for master revision

#1377

Blacklist resources managed by ensure_dependencies.py in Git

#1380

Update jshydra dependency in buildtools repository to revision 90ac35f240c2

#1398

Improve backwards-compatibility of ensure_dependencies.py

#1449

Prefer Mercurial over Git

#1590

Add devenv support to run tests on Safari

What to change

Update the "buildtools" submodule to revision 5dd147a93316.

[sebastian]

​https://hg.adblockplus.org/adblockpluschrome/rev/2484aefe1640