Refactor msvc slightly w/ `while let`
Refactor msvc slightly w/ `while let`

Helps avoid some extra indentation

glandium/sccache,luser/sccache2,glandium/sccache,luser/sccache2,glandium/sccache,mozilla/sccache,glandium/sccache,mozilla/sccache,luser/sccache2,luser/sccache2,mozilla/sccache