rustup.sh creates executable HTML and JS files in documentation directory

[genodeftest]

After running rustup.sh today, I have several hundred executable HTML and JS (and some more) files below /usr/local/share/doc/rust/html/. I don't think this is intentional.

Affected versions:

• rustup.sh from static.rust-lang.org from today, with today's nightly for x86_64 linux systems
• rustup.sh from end of may, with nightly from mid-june