bootstrap: only encode RUSTFLAGS when a flag contains a space
Bootstrap now passes rustc and rustdoc flags via CARGO_ENCODED_RUSTFLAGS
and CARGO_ENCODED_RUSTDOCFLAGS, whose values use \x1f to separate flags.
That control character renders as \u{1f} when a failing command is
debug-printed, so the printed command can't be copy-pasted.
Prefer the plain, space-separated RUSTFLAGS/RUSTDOCFLAGS form, which is
equivalent whenever no flag value contains a space, and only fall back to
the encoded form when a flag value does contain a space.
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