Fixed the library to use the new Rust 2018 module system.

src/c/stddef.rs

@@ -1,2 +1,3 @@
 /// This defines the size_t type.
+#[allow(non_camel_case_types)]
 pub type size_t = usize;

src/lib.rs

@@ -12,12 +12,8 @@
 #[cfg(not(feature="use_std"))]
 extern crate core as std;
 
-#[macro_use]
 extern crate scribe;
-
-#[macro_use]
 extern crate binding;
-
 extern crate weave;