Rollup merge of #139823 - WaffleLapkin:bootpaper, r=jieyouxu

Fix some bootstrap papercuts

... related to jj and my `./build` symlink setup[^1].

I'm not sure if these are good solutions, but they seem to work. See commits for a bit more info.

r? ``@jieyouxu``

[^1]: see #139804

Author: matthiaskrgr