message: Fix Appveyor builds.
diff: @@ -6,10 +6,10 @@ environment:
  GNUPLOT: no
  install:
  - - ps: Start-FileDownload "https://static.rust-lang.org/dist/rust-stable-${env:TARGET}.exe"
  - - rust-stable-%TARGET%.exe /VERYSILENT /NORESTART /DIR="C:\Program Files (x86)\Rust"
  - - SET PATH=%PATH%;C:\Program Files (x86)\Rust\bin
  - - rustc -V
  + - curl -sSf -o rustup-init.exe https://win.rustup.rs/
  + - rustup-init.exe -y --default-host %TARGET% --default-toolchain stable
  + - SET PATH=%PATH%;C:\Users\appveyor\.cargo\bin
  + - rustc -Vv
  - cargo -V
  - ps: if (${env:GNUPLOT} -eq "yes") { Start-FileDownload "https://sourceforge.net/projects/gnuplot/files/gnuplot/4.6.7/gp467-win64-setup.exe"; }
  - if %GNUPLOT%==yes gp467-win64-setup.exe /VERYSILENT /NORESTART
  