dist: Make use of effective-limits be reliant on non-bsd

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

Author: kinnison

src/dist/component/package.rs

@@ -298,13 +298,21 @@ fn unpack_without_first_dir<'a, R: Read>(
         .entries()
         .chain_err(|| ErrorKind::ExtractingPackage)?;
     const MAX_FILE_SIZE: u64 = 220_000_000;
-    let effective_max_ram = match effective_limits::memory_limit() {
-        Ok(ram) => Some(ram as usize),
-        Err(e) => {
-            if let Some(h) = notify_handler {
-                h(Notification::Error(e.to_string()))
+    let effective_max_ram = {
+        cfg_if::cfg_if! {
+            if #[cfg(not(any(target_os="freebsd", target_os="netbsd")))] {
+                match effective_limits::memory_limit() {
+                    Ok(ram) => Some(ram as usize),
+                    Err(e) => {
+                        if let Some(h) = notify_handler {
+                            h(Notification::Error(e.to_string()))
+                        }
+                        None
+                    }
+                }
+            } else {
+                None
             }
-            None
         }
     };
     let mut budget = MemoryBudget::new(MAX_FILE_SIZE as usize, effective_max_ram, notify_handler);