fix nebula-ffi buildscript

nebula-ffi/build.rs

@@ -4,19 +4,16 @@ use std::path::PathBuf;
 use std::{env, process};
 
 fn get_cargo_target_dir() -> Result<std::path::PathBuf, Box<dyn std::error::Error>> {
+    let skip_triple = std::env::var("TARGET")? == std::env::var("HOST")?;
+    let skip_parent_dirs = if skip_triple { 4 } else { 5 };
+
     let out_dir = std::path::PathBuf::from(std::env::var("OUT_DIR")?);
-    let profile = std::env::var("PROFILE")?;
-    let mut target_dir = None;
-    let mut sub_path = out_dir.as_path();
-    while let Some(parent) = sub_path.parent() {
-        if parent.ends_with(&profile) {
-            target_dir = Some(parent);
-            break;
-        }
-        sub_path = parent;
+    let mut current = out_dir.as_path();
+    for _ in 0..skip_parent_dirs {
+        current = current.parent().ok_or("not found")?;
     }
-    let target_dir = target_dir.ok_or("not found")?;
-    Ok(target_dir.to_path_buf())
+
+    Ok(std::path::PathBuf::from(current))
 }
 
 fn main() {