Compile and link 'libdome_key_event_source_simulator'

Turn this into a build dependency with Make.

Use Vladimir Matveev (https://stackoverflow.com/users/788207/vladimir-matveev)
and Shepmaster's
(https://stackoverflow.com/users/155423/shepmaster) answer on Stack
Overflow to sort out getting Cargo the search path for the static
library:
https://stackoverflow.com/questions/26246849/how-to-i-tell-rust-where-to-look-for-a-static-library/26254062#26254062

For some reason I wasn't able to get it to work by just putting the
library into `./target/debug/deps/`. I had to explicitly tell Cargo to
put that in the search path.

Also, we need to use `std::env` instead of the `env!` macro to get the
`PROFILE` environment variable, otherwise it won't be initialised at the
right time, as described in the Rust docs:

> Because these variables are not yet set when the build script is
> compiled, the above example using env! won't work and instead you'll
> need to retrieve the values when the build script is run

(https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)

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