bug#73431: Add `setf` support for `stream.el` in ELPA

[Okamsn]

Stefan Monnier wrote:
>> Is there a major downside to using `cl-defstruct` to define a stream?
> 
> Probably not major, no.  Beware: it'll come with several upsides, tho.
> 
> 
>          Stefan
> 

Hello,

Please see the attached file. It changes streams to be structs, warns 
that streams are not mutable, adds a creation method for arrays that 
doesn't create intermediate sub-arrays, and adds some methods for 
streams for more of the seq.el functions.

Please let me know what you would like changed.

Thank you.

0001-Change-stream.el-to-use-structs-instead-of-cons-cell.patch
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