Cleanup clm build rules for Windows

- The `sed` call is no longer needed due to a bugfix in clm (the library
paths may now be 1024 characters long already upstream)
- Replace `cd` with `make -C`
- Tabs for indentation
1 job for cleanup-clm-on-windows in 3 minutes and 49 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #109796
test

00:03:49