Store all args in the unsupported Command implementation

This allows printing them in the Debug impl as well as getting them
again using the get_args() method. This allows programs that would
normally spawn another process to more easily show which program they
would have spawned if not for the fact that the target doesn't support
spawning child processes without requiring intrusive changes to keep the
args. For example rustc compiled to wasi will show the full linker
invocation that would have been done.

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