fix cargo installing in ./.cargo, and other misc things #2578
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Good morning all,
The main commit fixes a Cargo bug. It currently doesn't work in the local directory mode because it tries to make a ./.cargo/work directory before the .cargo gets made.
Also, in order to suppress the cargo warnings about failing to install the OSX .dSYM directories, I switched cargo to use
cp -r
instead ofcp
. I'm not sure if this is portable to windows though. We need to create our own recursive copy. I'll file a bug report for that.