Auto merge of #31802 - alexcrichton:fix-dist-rustbuild, r=japaric
Auto merge of #31802 - alexcrichton:fix-dist-rustbuild, r=japaric

Forgot to add a few directories to `make dist` so `--enable-rustbuild` can
continue to work.

Closes #31801

aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,graydon/rust,graydon/rust,graydon/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,graydon/rust