Explicitly install OpenSSL on AppVeyor CI

appveyor.yml

@@ -1,4 +1,5 @@
 environment:
+  SSL_CERT_FILE: "C:\\OpenSSL\\cacert.pem"
   RUSTUP_USE_HYPER: 1
   CARGO_HTTP_CHECK_REVOKE: false
   GITHUB_TOKEN:
@@ -6,10 +7,18 @@ environment:
 
   matrix:
     - TARGET: x86_64-pc-windows-msvc
-      OTHER_TARGET: i686-pc-windows-msvc
-      MAKE_TARGETS: test-unit-x86_64-pc-windows-msvc
+      BITS: 64
+      OPENSSL_VERSION: 1_1_0j
+      OPENSSL_DIR: C:\OpenSSL
 
 install:
+  # Install OpenSSL
+  - mkdir C:\OpenSSL
+  - ps: if (Test-Path env:OPENSSL_VERSION) { Start-FileDownload "http://slproweb.com/download/Win${env:BITS}OpenSSL-${env:OPENSSL_VERSION}.exe" }
+  - if defined OPENSSL_VERSION Win%BITS%OpenSSL-%OPENSSL_VERSION%.exe /SILENT /VERYSILENT /SP- /DIR="C:\OpenSSL"
+  - appveyor DownloadFile https://curl.haxx.se/ca/cacert.pem -FileName C:\OpenSSL\cacert.pem
+
+  # Install Rust
   - appveyor-retry appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
   - rustup-init.exe -y --default-host x86_64-pc-windows-msvc --default-toolchain nightly
   - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin