Enable and fix several more clippy lints.

lib/simplejit/src/lib.rs

@@ -1,6 +1,20 @@
 //! Top-level lib.rs for `cretonne_simplejit`.
 
 #![deny(missing_docs, trivial_numeric_casts, unused_extern_crates)]
+#![warn(unused_import_braces, unstable_features)]
+#![cfg_attr(feature = "clippy", plugin(clippy(conf_file = "../../clippy.toml")))]
+#![cfg_attr(feature = "cargo-clippy",
+            allow(new_without_default, new_without_default_derive))]
+#![cfg_attr(feature="cargo-clippy", warn(
+                float_arithmetic,
+                mut_mut,
+                nonminimal_bool,
+                option_map_unwrap_or,
+                option_map_unwrap_or_else,
+                print_stdout,
+                unicode_not_nfc,
+                use_self,
+                ))]
 
 extern crate cretonne_codegen;
 extern crate cretonne_module;

lib/simplejit/src/memory.rs

@@ -25,7 +25,7 @@ impl PtrLen {
             let err = libc::posix_memalign(&mut ptr, page_size, alloc_size);
             if err == 0 {
                 Ok(Self {
-                    ptr: mem::transmute(ptr),
+                    ptr: ptr as *mut u8,
                     len: alloc_size,
                 })
             } else {