Use upstream lazy_static and update once crate

Cargo.toml

@@ -6,7 +6,7 @@ version = "0.1.0"
 [dependencies]
 bit_field = "0.1.0"
 bitflags = "0.7.0"
-once = "0.2.1"
+once = "0.3.2"
 rlibc = "0.1.4"
 spin = "0.3.4"
 
@@ -20,6 +20,10 @@ git = "https://github.com/phil-opp/multiboot2-elf64"
 default-features = false
 version = "0.7.1"
 
+[dependencies.lazy_static]
+version = "0.2.1"
+features = ["spin_no_std"]
+
 [lib]
 crate-type = ["staticlib"]
 

src/lib.rs

@@ -24,6 +24,8 @@ extern crate x86;
 #[macro_use]
 extern crate once;
 extern crate bit_field;
+#[macro_use]
+extern crate lazy_static;
 
 extern crate hole_list_allocator;
 extern crate alloc;