Removed CMake install

.appveyor.yml

@@ -32,17 +32,6 @@ matrix:
     - image: Visual Studio 2017
       platform: x86
 
-cache:
-  - C:\cmake-3.8.0-win32-x86
-
-install:
-  - ps: |
-      if (![IO.File]::Exists("C:\cmake-3.8.0-win32-x86\bin\cmake.exe")) {
-        Start-FileDownload 'https://cmake.org/files/v3.8/cmake-3.8.0-win32-x86.zip'
-        7z x -y cmake-3.8.0-win32-x86.zip -oC:\
-      }
-      $env:PATH="C:\cmake-3.8.0-win32-x86\bin;$env:PATH"
-
 before_build:
   - ps: |
       mkdir build