Incorporate Windows-based CI (AppVeyor et al)

[frewsxcv]

Previous attempt #9406

[larsbergstrom]

I've been working on this more here:
https://github.com/larsbergstrom/servo/tree/appveyor

[UK992]

I've been playing around Appveyor lately again and it work now.
Took 1 hour and 10 minutes to build, about half of this time only mozjs stuff.

https://ci.appveyor.com/project/UK992/servo-hga0y/build/1.0.130
UK992@1cb6952

[larsbergstrom]

@UK992 OMG, that's awesome! Fantastic work :-)

The nice thing about mozjs is that we should have CCACHE support, so we may be able to have that be a one-time (or once per-upgrade per-machine) deal.

[larsbergstrom]

Hrm, it looks like heapsize is still failing with:

note: C:\Users\appveyor\AppData\Local\Temp\1\rustc.YtB1bF5ggNNd\libheapsize-da165bc9088f0d78.rlib(heapsize-da165bc9088f0d78.0.o): In function `heapsize::heap_size_of':
C:/projects/servo/.cargo\registry\src\github.com-88ac128001ac3a9a\heapsize-0.2.5\src/lib.rs:41: undefined reference to `je_malloc_usable_size'
collect2.exe: error: ld returned 1 exit status

error: aborting due to previous error
Build failed, waiting for other jobs to finish...

cc @Jayflux

[nox]

heapsize-0.2.5

You need to update that.

[UK992]

And also need this patch UK992@bf43c1c to solve alloc_jemalloc crate problem

[UK992]

And just for information, if building took more than 1 hour will hit build timeout, in that case, contact Appveyor support team for extend build timeout to 2 hours. I did this too.

[larsbergstrom]

@UK992 I went ahead and contacted them, too, and they let me try the premium/2CPU machines. They took the build down to 52 minutes. I'm looking into possibly getting a premium contract for the Servo GH org :-)