Add setup script, remove openlibm from post-link (might have to readd later)

cook.sh

+#!/bin/bash
+
 export RUST_TARGET_PATH=`realpath targets`
 export RUSTFLAGS="--cfg redox"
 TARGET=x86_64-unknown-redox

setup.sh

+#!/bin/bash
+
+set -e
+
+./cook.sh libstd unfetch
+./cook.sh libstd fetch
+./cook.sh libstd build
+cp recipes/libstd/build/target/x86_64-unknown-redox/debug/deps/*.rlib ~/.xargo/lib/rustlib/x86_64-unknown-redox/lib/
+
+echo "cook.sh is ready to use"

targets/x86_64-unknown-redox.json

@@ -9,7 +9,6 @@
     "vendor": "unknown",
     "target-family": "redox",
     "pre-link-args": ["-m64", "-nostdlib", "-static"],
-    "post-link-args": ["build/userspace/libopenlibm.a"],
     "features": "-sse3,-ssse3,-sse4.1,-sse4.2,-3dnow,-3dnowa,-avx,-avx2",
     "dynamic-linking": false,
     "executables": true,