azure: Prepare configuration for 4-core machines

This commit updates some of our assorted Azure/CI configuration to
prepare for some 4-core machines coming online. We're still in the
process of performance testing them to get final numbers, but some
changes are worth landing ahead of this. The updates here are:

* Use `C:/` instead of `D:/` for submodule checkout since it should have
  plenty of space and the 4-core machines won't have `D:/`

* Update `lzma-sys` to 0.1.14 which has support for VS2019, where 0.1.10
  doesn't.

* Update `src/ci/docker/run.sh` to work when it itself is running inside
  of a docker container (see the comment in the file for more info)

* Print step timings on the `try` branch in addition to the `auto`
  branch in. The logs there should be seen by similarly many humans (not
  many) and can be useful for performance analysis after a `try` build
  runs.

* Install the WIX and InnoSetup tools manually on Windows instead of
  relying on pre-installed copies on the VM. This gives us more control
  over what's being used on the Azure cloud right now (we control the
  version) and in the 4-core machines these won't be pre-installed. Note
  that on AppVeyor we actually already were installing InnoSetup, we
  just didn't carry that over on Azure!

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