Update crate dependencies

Author: dylanmckay

Cargo.toml

@@ -15,6 +15,6 @@ documentation = "https://avr-rust.github.io/libc/avr_libc/"
 keywords = ["avr", "libc", "arduino", "avr-gcc"]
 
 [build-dependencies]
-bindgen = "0.31"
-avr-mcu = "0.2"
-lazy_static = "0.2"
+bindgen = "0.54"
+avr-mcu = "0.3"
+lazy_static = "1.4"

src/rust_ctypes.rs

@@ -10,7 +10,7 @@ pub type c_uchar = u8;
 #[allow(dead_code)] pub type c_ushort = u16;
 pub type c_uint = u16;
 pub type c_ulong = u32;
-pub type c_ulonglong = u64;
+#[allow(dead_code)] pub type c_ulonglong = u64;
 
 // Not C compliant.
 #[allow(dead_code)]