rust.md

Rust fixes for OSX

Softlink these to ~/bin to fix rust build errors

~/bin/fix-rust will do the following:

cc -> /usr/bin/cc*
g++ -> /usr/bin/g++*
gcc -> /usr/bin/gcc*
ld -> /usr/bin/ld*
lldb -> /usr/bin/lldb*
llvm-g++ -> /usr/bin/llvm-g++*
llvm-gcc -> /usr/bin/llvm-gcc*