Use gox to cross compile the binaries

cross-compile

@@ -1,16 +1,11 @@
-#!/bin/echo Source this file don't run it
-# Cross compile all the architectures using
-# http://dave.cheney.net/2012/09/08/an-introduction-to-cross-compilation-with-go
+#!/bin/sh
+
+# This uses gox from https://github.com/mitchellh/gox
+# Make sure you've run gox -build-toolchain
 
 rm -rf build
-mkdir -p build
-mkdir -p build/osx
-mkdir -p build/windows
-mkdir -p build/freebsd/386
-mkdir -p build/freebsd/amd64
-mkdir -p build/linux/386
-mkdir -p build/linux/amd64
-mkdir -p build/linux/arm
+
+gox -output "build/{{.OS}}/{{.Arch}}/{{.Dir}}"
 
 cat <<'#EOF' > build/README.txt
 This directory contains builds of the stressdisk program.
@@ -28,30 +23,4 @@ The files in this directory are organised by OS and processor type
 
 #EOF
 
-#echo darwin-386
-#go-darwin-386 build -o build/osx/386/stressdisk
-
-echo OSX
-go-darwin-amd64 build -o build/osx/stressdisk
-
-echo freebsd-386
-go-freebsd-386 build -o build/freebsd/386/stressdisk
-
-echo freebsd-amd64
-go-freebsd-amd64 build -o build/freebsd/amd64/stressdisk
-
-echo linux-386
-go-linux-386 build -o build/linux/386/stressdisk
-
-echo linux-amd64
-go-linux-amd64 build -o build/linux/amd64/stressdisk
-
-echo linux-arm
-go-linux-arm build -o build/linux/arm/stressdisk
-
-echo windows-386
-go-windows-386 build -o build/windows/stressdisk.exe
-
-#go-windows-amd64 build
-
 ( cd build ; tree . >> README.txt )