build(opencascade-sys): rework building process of OpenCACADE

The previous building process had multiple issues:

- When for example running 'cargo clean && cargo build --workspace
  --release'. Cargo launched two simultaneous compilations of
  opencascade resulting in a race conditions cloning the source code.

- Builds and source code where compiled into the source directory
  instead of the target/ folder.

- Builds of OpenCASCADE did not reflect the correct optmimization level,
  since building happened inside a build-dependency instead of a
  dependency of occara

This new approach fixes all of the above listed issues.

crates/occara/build.rs

@@ -1,7 +1,7 @@
 use walkdir::WalkDir;
 
 fn main() -> miette::Result<()> {
-    let include_dir = opencascade_sys::include_dir();
+    let build = opencascade_sys::OpenCascadeSource::new().build();
     // Find all cpp files in the cpp directory
     let files: Vec<_> = WalkDir::new("cpp")
         .into_iter()
@@ -33,7 +33,7 @@ fn main() -> miette::Result<()> {
     // Generate autocxx bindings
     let mut autocxx_build = autocxx_build::Builder::new(
         "src/ffi.rs",
-        [&std::path::PathBuf::from("include"), &include_dir],
+        [&std::path::PathBuf::from("include"), build.include_dir()],
     )
     .build()?;
 
@@ -43,6 +43,6 @@ fn main() -> miette::Result<()> {
         .compile("occara-autocxx-bridge");
     println!("cargo:rerun-if-changed=src/ffi.rs");
 
-    opencascade_sys::link_opencascade();
+    build.link();
     Ok(())
 }

crates/opencascade-sys/Cargo.toml

@@ -6,7 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-
-[build-dependencies]
 cmake = "0.1.50"
 walkdir = "2.4.0"