[WIP] Upgrade to upstream v8 6.7

[ignisf]

• Update build automation
• Check FreeBSD support (none until Chromium's depot_tools do not work on FreeBSD which causes the build of v8 6.2+ to fail #253 is fixed)
• Check Alpine support (none until Chromium's depot_tools are not able to fetch V8's source on Alpine Linux #259 is fixed)
• Check ARM support
• Automate creation of debug binary

Fixes #255
Fixes #228
Fixes rubyjs/mini_racer#85

[SamSaffron]

@ignisf any chance for a release this week, super keep to bump mini_racer due to segfault etc...

[ignisf]

@SamSaffron, I've been trying to get the library to compile for ARM, and have not been able to. If we release now, we're losing support for ARM, FreeBSD and Alpine Linux...

Now, I am fine with that, considering this PR nukes all the functionality that made it possible to compile for those platforms with GYP, however maybe mini_racer should have a version with the segfault-related fixes that depends on the older more portable V8 version?

[SamSaffron]

OK, no problem ❤️ ... 0.2.0 is now out and it is cross compatible with 6.3 and up

So this gives us some time to get ARM support (though for Discourse I am going to push the libv8 dep explicitly to 6.7)

[ignisf]

yes, awesome!

[ignisf]

it's live 🎉

[SamSaffron]

Yay!!! Going to upgrade Discourse on Monday!

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