revive llvm builder utility (#154)

Pre-eliminary support for LLVM releases and resolc binary releases by streamlining the build process for all supported hosts platforms.

- Introduce the revive-llvm-builder crate with the revive-llvm builder utilty.
- Do not rely on the LLVM dependency in $PATH to decouple the system LLVM installation from the LLVM host dependency.
- Fix the emscripten build by decoupling the host and native LLVM dependencies. Thus allowing a single LLVM emscripten release that can be used on any host platform.
- An example Dockerfile building an alpine container with a fully statically linked resolc ELF binary.
- Remove the Debian builder utilities and workflow.

crates/build-utils/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "revive-build-utils"
+version.workspace = true
+license.workspace = true
+edition.workspace = true
+repository.workspace = true
+authors = [
+    "Cyrill Leutwiler <cyrill@parity.io>",
+]
+description = "Shared build utilities of the revive compiler"
+
+[lib]
+doctest = false
+
+[dependencies]