appveyor: Clean up after install
We were leaving a `rustup-init.exe` behind which dirtied the
git repository, meaning that the version number was unpleasant for
Windows users.  This fixes that.
@@ -50,6 +50,7 @@ install:
- appveyor-retry appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
- rustup-init.exe -y --default-host=x86_64-pc-windows-msvc
- set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
+ - del rustup-init.exe
# Install the target we're compiling for
- if NOT "%TARGET%" == "x86_64-pc-windows-msvc" rustup target add %TARGET%
