workaround the rust issue (#397)

This works around rust-lang/rust#108853 by using an `opt-level` of `3`
rather than `s`.

- [x] Changelog updated / no changelog update needed

Author: corwinkuiper

agb/Cargo.toml

@@ -12,8 +12,8 @@ opt-level = 3
 debug = true
 
 [profile.release]
-opt-level = "s"
-lto = "thin"
+opt-level = 3
+lto = "fat"
 debug = true
 
 [features]