Enable thin LTO

archseer · archseer · commit cccc1949ebab · 2021-11-15T14:38:03.000+09:00
It compiles about half a second slower for me, so it seems fine to use
by default.
diff --git a/Cargo.toml b/Cargo.toml
@@ -14,3 +14,6 @@ members = [
 
 [profile.dev]
 split-debuginfo = "unpacked"
+
+[profile.release]
+lto = "thin"
