Cleanup Redox repo, update Rust, remove old target

kernel/arch/x86_64/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "arch_x86_64"
+version = "0.1.0"
+
+[dependencies]
+bitflags = "*"
+hole_list_allocator = { path = "../../../crates/hole_list_allocator/" }
+io = { path = "../../../crates/io/" }
+raw-cpuid = { git = "https://github.com/gz/rust-cpuid" }
+spin = "*"
+redox_syscall = { path = "../../../syscall/" }
+
+[dependencies.x86]
+version = "0.7"
+default-features = false