Command arguments are passed to the kernel as a vector, so joining them
with plain spaces loses the boundaries between them. An argument holding
whitespace or a shell metacharacter reads back as several arguments, or
as several commands.
FormatCommand renders a command and its arguments as a single line a
POSIX shell reads back as the original vector. Quoting is minimal: an
argument is single-quoted only when it contains a character the shell
would not pass through literally, so the flag-heavy command lines rook
builds stay readable.
Signed-off-by: Joshua Hoblitt <josh@hoblitt.com>
