Auto merge of #29653 - alexcrichton:fix-distcheck-again-zomg, r=brson
Auto merge of #29653 - alexcrichton:fix-distcheck-again-zomg, r=brson

The recent change of libdir on windows was accidentally not propagated to
`make dist` and related commands. This commit touches that up!

Closes #29640

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