build: Make `turbo-malloc` not depend on mimalloc on linux (#4121)
### Description
This PR fixes the build failure caught at
https://github.com/vercel/next.js/pull/46909
### Testing Instructions
I reverted
https://github.com/vercel/turbo/blob/80516ff6f24cd1e83bc4e99a76bff9f0c9e2c42c
partially