Add release profile config. Fix unused import warning.

Author: buybackoff

src/rust/Cargo.toml

@@ -6,3 +6,11 @@ members = [
     "sqlite-sys",
     "sandbox"
 ]
+
+[profile.release]
+opt-level = 3
+debug = false
+rpath = false
+lto = true
+debug-assertions = false
+panic = 'abort'

src/rust/blosc-sys/build.rs

@@ -1,8 +1,6 @@
 extern crate cmake;
 extern crate bindgen;
 
-use std::env;
-
 fn main() {
     // TODO deduplicate code, only MinGW line for Windows, check if on MSVC
     if cfg!(windows) {
@@ -78,7 +76,7 @@ fn main() {
     //     .expect("Unable to generate bindings");
 
     // // Write the bindings to the $OUT_DIR/bindings.rs file.
-    // let out_path = std::path::PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
+    // let out_path = std::path::PathBuf::from(std::env::var("CARGO_MANIFEST_DIR").unwrap());
     // bindings
     //     .write_to_file(out_path.join("src/bindings.rs"))
     //     .expect("Couldn't write bindings!");