Update gyp to the recent version

[sergz]

Background

Current version of gyp does not allow to generate solution/project files for MS Visual Studio 2013.

Note

• with new gyp there is a trouble. The generated project contains in the custom action "--random-seed" "..\..\..\..\..\..\third_party\v8\tools\gyp\314159265" instead of "--random-seed" "314159265" (the relative path should not be added). Its source is v8_random_seed in libadblockplus\third_party\v8\tools\gyp\v8.gyp.
• there are our changes in gyp which should be rebased (see ​https://github.com/adblockplus/gyp/commit/8035ac91ddef78ed6fae19fca67702934c5322a3, it's in fix-issue-339 branch)

[fhd]

Updated. I had to push the entire tree as a new head to hg.adblockplus.org/gyp, because the ID mapping has changed since that clone was first created. By keeping the old head, the old refs still work.

[fhd]

We still need Wladimir's old patch to keep the Android build on working. I'll have to merge all changes since then into that branch to keep the old refs working.

[fhd]

Merged master into fix-issue-339.

[sergz]

It's still relevant because our fix in gyp does not help here.

[eric@adblockplus.org]

Issue description says "current version of gyp". What version of gyp is that? Which one are we updating to?

[sergz]

Gyp is updated to ​https://github.com/adblockplus/gyp/commit/8ffe7e7b1b82890a7e9ea21176bf039b6c53167b (which is based on 70fa8bbeb2921c51b34598d3eda8e5fc485e952c, 2 years ago (2015-11-12 23:09:31), and includes our changes) as a part of #4907. Although this version is not the recent one, the development of gyp is not active and it seems there is nothing very essential for us there.

So, current version of gyp allows to generate solutions for VS 2013 (what this issue is about, but this version is not relevant anymore) as well as for VS 2015 (what is actually used and it even works with VS 2017). Therefore this issue can be closed, please create a new one when a required functionality appears in gyp repository and there is a demand in it.