SICP not building on the build server

[soegaard]

Hi @NoahStoryM and @sorawee

Right now sicp doesn't build on the build server [1].

The reason is that the build server uses version 8.5, but the new typed/sicp
relies on improvements to typed/racket which are in the development version only.
(The type Image-Snip% was added recently.)

Therefore we need to wait until the next release before merge the changes.

So in short: I am reverting the changes for now. When the new release is out,
I'll remerge the changes again.

I am sorry for the inconvenience.

[1] https://pkg-build.racket-lang.org/server/built/fail/sicp.txt

[soegaard]

I have now reverted the changes.
If I have done this right, it should be reasonably easy to apply the commits again after the release.

[NoahStoryM]

Hi @soegaard , I guess it's time to remerge these changes since v8.6 was released.