Add workaround for u64 shifts

gergoerdi · gergoerdi · commit 12c9917c95bd · 2022-12-18T19:02:36.000+08:00
from rust-lang/rust#82242 (comment)
diff --git a/.cargo/config b/.cargo/config
@@ -3,6 +3,7 @@ target = "avr-atmega328p.json"
 
 [unstable]
 build-std = ["core"]
+build-std-features = ["compiler-builtins-mangled-names"] # https://github.com/rust-lang/rust/issues/82242#issuecomment-997400373
 
 [env]
 AVR_CPU_FREQUENCY_HZ = "16_000_000"
