Prevent cpuid get_extended_function_info panic
A kernel panic occurs on some CPUs (notably qemu-system-x86_64) when
calling rust-cpuid's get_extended_function_info.  This is fixed upstream
in commit but has yet to make
it crates.io.
The panic can by triggered by running "ls sys:" from ion and causes
redox to become unresponsive.
@@ -5,7 +5,7 @@ version = "0.1.0"
[dependencies]
alloc_kernel = { path = "../../alloc_kernel/" }
bitflags = "0.7"
-raw-cpuid = "2.0"
+raw-cpuid = { git = "https://github.com/gz/rust-cpuid", branch = "master" }
spin = "0.4"
redox_syscall = "0.1"
