Added a src/etc/vim/ftdetect directory and file.

Previously, in order to get vim's syntax highlighting, you needed to manually `:setf rust` on every file. Now vim will recognize *.rs files as rust. This is a little nicer.
rust-lang · Jan 21, 2012 · 1290e41 · 1290e41
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commit 1290e41
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/etc/vim/ftdetect/rust.vim b/src/etc/vim/ftdetect/rust.vim
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+au BufRead,BufNewFile *.rs    set filetype=rust