Added InnoSetup

.azure/install-innosetup.yml

@@ -0,0 +1,15 @@
+# This template installs InnoSetup
+
+steps:
+  - powershell: |
+      Invoke-WebRequest https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rust-ci-mirror/2017-08-22-is.exe
+      2017-08-22-is.exe /VERYSILENT /SUPPRESSMSGBOXES /NORESTART /SP-
+      Write-Host "##vso[task.prependpath]C:\Program Files (x86)\Inno Setup 5"
+    displayName: Install InnoSetup - Windows
+    condition: eq(variables['Agent.OS'], 'Windows_NT')
+
+  - bash: |
+      set -ex
+      iscc
+    displayName: InnoSetup
+    condition: eq(variables['Agent.OS'], 'Windows_NT')

azure-pipelines.yml

@@ -63,6 +63,7 @@ jobs:
     - template: .azure/install-sccache.yml
     - template: .azure/install-cmake.yml
     - template: .azure/install-llvm.yml
+    - template: .azure/install-innosetup.yml
     - bash: make check
       displayName: Check with Flags
       condition: and(succeeded(), not(eq(variables['Agent.OS'], 'Windows_NT')))