Create --target directories lazily (#3274)

## Summary

Based on feedback in
https://github.com/astral-sh/uv/pull/3257#issuecomment-2078560574.

crates/install-wheel-rs/src/linker.rs

@@ -85,11 +85,18 @@ pub fn install_wheel(
     )?;
     let mut record = read_record_file(&mut record_file)?;
 
-    debug!(name, "Writing entrypoints");
     let (console_scripts, gui_scripts) =
         parse_scripts(&wheel, &dist_info_prefix, None, layout.python_version.1)?;
-    write_script_entrypoints(layout, site_packages, &console_scripts, &mut record, false)?;
-    write_script_entrypoints(layout, site_packages, &gui_scripts, &mut record, true)?;
+
+    if console_scripts.is_empty() && gui_scripts.is_empty() {
+        debug!(name, "No entrypoints");
+    } else {
+        debug!(name, "Writing entrypoints");
+
+        fs_err::create_dir_all(&layout.scheme.scripts)?;
+        write_script_entrypoints(layout, site_packages, &console_scripts, &mut record, false)?;
+        write_script_entrypoints(layout, site_packages, &gui_scripts, &mut record, true)?;
+    }
 
     // 2.a Unpacked archive includes distribution-1.0.dist-info/ and (if there is data) distribution-1.0.data/.
     // 2.b Move each subtree of distribution-1.0.data/ onto its destination path. Each subdirectory of distribution-1.0.data/ is a key into a dict of destination directories, such as distribution-1.0.data/(purelib|platlib|headers|scripts|data). The initially supported paths are taken from distutils.command.install.

crates/install-wheel-rs/src/wheel.rs

@@ -537,6 +537,7 @@ pub(crate) fn install_data(
                 move_folder_recorded(&path, &layout.scheme.data, site_packages, record)?;
             }
             Some("scripts") => {
+                let mut initialized = false;
                 for file in fs::read_dir(path)? {
                     let file = file?;
 
@@ -556,6 +557,12 @@ pub(crate) fn install_data(
                         continue;
                     }
 
+                    // Create the scripts directory, if it doesn't exist.
+                    if !initialized {
+                        fs::create_dir_all(&layout.scheme.scripts)?;
+                        initialized = true;
+                    }
+
                     install_script(layout, site_packages, record, &file)?;
                 }
             }

crates/uv-interpreter/src/target.rs

@@ -22,8 +22,6 @@ impl Target {
     /// Initialize the `--target` directory.
     pub fn init(&self) -> std::io::Result<()> {
         fs_err::create_dir_all(&self.0)?;
-        fs_err::create_dir_all(self.0.join("bin"))?;
-        fs_err::create_dir_all(self.0.join("include"))?;
         Ok(())
     }