Use freetype-sys on Linux.

[SimonSapin]

See:
servo/libfreetype2#2
servo/skia#38
servo/rust-azure#114

Let’s close #3867, even though this only works around and doesn’t fix the underlying issue.

r? @larsbergstrom

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[larsbergstrom]

r+

[bors-servo]

saw approval from larsbergstrom
at SimonSapin@b1eb403

[bors-servo]

merging SimonSapin/servo/freetype-sys-linux = b1eb403 into auto

[bors-servo]

SimonSapin/servo/freetype-sys-linux = b1eb403 merged ok, testing candidate = 617e32b

[bors-servo]

some tests failed:
failure: http://build.servo.org/builders/linux/builds/623

[SimonSapin]

So freetype-sys defaults to using bzip2, which the builders current don’t have installed. We can make this a new requirement, or compile with:

libfreetype2% ./configure --help | grep bz
  --without-bzip2         do not support bzip2 compressed fonts

But I have no idea how common bzip2 compressed fonts are.

[larsbergstrom]

I suspect we'll have to support it - from random googling, Ubuntu Linux appears to like to ship bzip2 compressed fonts. I guess I'll have to add the package to the builders and we should add a note to the readme about installing the correct package.

[larsbergstrom]

r+

[mbrubeck]

@bors: retry

[SimonSapin]

@bors: retry

[bors-servo]

saw approval from larsbergstrom
at SimonSapin@ed9e307

[bors-servo]

merging SimonSapin/servo/freetype-sys-linux = ed9e307 into auto

[bors-servo]

SimonSapin/servo/freetype-sys-linux = ed9e307 merged ok, testing candidate = e9322bb

[bors-servo]

some tests failed:
failure: http://build.servo.org/builders/mac1/builds/166

[bors-servo]

saw approval from larsbergstrom
at SimonSapin@ed9e307

[bors-servo]

saw approval from larsbergstrom
at SimonSapin@ed9e307

[bors-servo]

merging SimonSapin/servo/freetype-sys-linux = ed9e307 into auto

[bors-servo]

SimonSapin/servo/freetype-sys-linux = ed9e307 merged ok, testing candidate = 644765e

[bors-servo]

all tests pass:
success: http://build.servo.org/builders/linux/builds/649
success: http://build.servo.org/builders/mac1/builds/191
success: http://build.servo.org/builders/mac2/builds/191

[bors-servo]

fast-forwarding master to auto = 644765e

[jdm]

task '<main>' panicked at 'assertion failed: `(left == right) && (right == left)` (left: `https://github.com/servo/green-rs?ref=servo`, right: `https://github.com/alexcrichton/green-rs#215f3c87`)', src/cargo/core/dependency.rs:130

@mbrubeck, this PR hit that when compiling cef, and zmike hit it locally as well. Any thoughts?

[mbrubeck]

I think the cargo panic may be fixed by #3985.