Update nightly in CI (#9501)

* Update nightly in CI

This commit updates nightly again in CI after failing to do so in #9496.
This fixes an issue in our release CI where CMake was misconfigured when

Update nightly in CI (#9501)

* Update nightly in CI

This commit updates nightly again in CI after failing to do so in #9496.
This fixes an issue in our release CI where CMake was misconfigured when
cross-compiling and creating `aarch64-pc-windows-msvc` artifacts.

prtest:full

* Try installing ninja

* Also install Ninja on Linux

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Try again to fix version info in CI builds (#9157)

Turns out just having `git` wasn't enough. In the containers things are
running as `root` and `git` doesn't like that so try to convince git
that i

Try again to fix version info in CI builds (#9157)

Turns out just having `git` wasn't enough. In the containers things are
running as `root` and `git` doesn't like that so try to convince git
that it should like it.

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Install `git` executable in container builds (#9152)

Precompiled artifacts for macOS show this for `wasmtime --version`

wasmtime-cli 24.0.0 (6fc3d274c 2024-08-20)

whereas for Linux they show

Install `git` executable in container builds (#9152)

Precompiled artifacts for macOS show this for `wasmtime --version`

wasmtime-cli 24.0.0 (6fc3d274c 2024-08-20)

whereas for Linux they show

wasmtime-cli 24.0.0

and this is due to `git` not being available in the build environment on
Linux.

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Clean up dist build configuration (#9113)

* Clean up dist build configuration

* Move updating `$PATH` to the `main.js` script which is the one that
mounts `/rust/bin` so that knowledge isn't spre

Clean up dist build configuration (#9113)

* Clean up dist build configuration

* Move updating `$PATH` to the `main.js` script which is the one that
mounts `/rust/bin` so that knowledge isn't spread around.
* Remove some unused env vars in docker containers.
* Forward cargo/rust-specific env vars to the build from outside of
containers to the build itself.

prtest:full

* Change how musl rustflags are configured

* More rustflags changes

* Review feedback

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Refactor installation of C API and features supported (#8642)

* Refactor installation of C API and features supported

This commit overhauls and refactors the management of the building of
the C AP

Refactor installation of C API and features supported (#8642)

* Refactor installation of C API and features supported

This commit overhauls and refactors the management of the building of
the C API. Instead of this being script-based it's now done entirely
through CMake and CMake is the primary focus for building the C API. For
example building the C API release artifacts is now done through CMake
instead of through a shell script's `cargo build` and manually moving
artifacts.

The benefits that this brings are:

* The C API now properly hides symbols in its header files that weren't
enabled at build time. This is done through a new build-time generated
`conf.h` templated on a `conf.h.in` file in the source tree.

* The C API's project now supports enabling/disabling Cargo features to
have finer-grained support over what's included (plus auto-management
of the header file).

* Building the C API and managing it is now exclusively done through
CMake. For example invoking `doxygen` now lives in CMake, installation
lives there, etc.

The `CMakeLists.txt` file for the C API is overhauled in the process of
doing this. The build now primarily matches on the Rust target being
built rather than the host target. Additionally installation will now
install both the static and shared libraries instead of just one.
Additionally during this refactoring various bits and pieces of
Android-specific code were all removed. Management of the C toolchain
feels best left in scope of the caller (e.g. configuring `CC_*` env vars
and such) rather than here.

prtest:full

* Don't use `option` for optional strings

* Invert release build check

Also adjust some indentation

* Fix more indentation

* Remove no-longer-used variable

* Reduce duplication in feature macro

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