TMI: rustpkg progress

I said yesterday that I got LLVM to build without a Makefile, but I didn't, really. The Android-related message that I thought was a warning was actually an error, but it took me most of the day to figure out for sure. The cause of the problem? There was code in our Rust wrapper for the LLVM library that was unconditionally initializing the command-line arguments on every call to LLVMRustWriteOutputFile. Since rustpkg may call this function twice -- once to write the executable for the package script, and one to write the executable or library (library, in this case) we're compiling, the error resulted. Cryptic for several hours, to crystal clear within a minute. This wasn't a problem in previous iterations of rustpkg since the change to add some Android-related flags was made recently.

Fixing it was easy, since apparently in LLVM, the flags that say whether a particular command-line flag is toggled are global state, and I submitted a pull request.

But I'm still kicking myself that it took me hours to track this down. Software engineering, folks.

Next, cleaning up the changes I made to rustpkg and rust-sdl (in the latter case, getting it to build with incoming Rust) so I can actually submit pull requests!