Appveyor: Remove clcache

.appveyor.yml

@@ -11,21 +11,12 @@ clone_depth: 50
 environment:
   global:
     PROJECT: libs\spirit
-    APPVEYOR_SAVE_CACHE_ON_ERROR: true
-    CLCACHE_HARDLINK: 1
-    APPVEYOR_CACHE_ENTRY_ZIP_ARGS: "-t7z -m0=lzma2 -mx=3 -md=32m -ms=on"
-    CLCACHE_CACHESIZE: 2123123123  # Appveyor allows us to store 1Gb of 7zipped cache but
-                                   # object files compress ratio is 20:1 in our case
 
   matrix:
     - { APPVEYOR_BUILD_WORKER_IMAGE: 'Visual Studio 2019', ADDRMDL: 64, TOOLSET: 'msvc-14.2' }
     - { APPVEYOR_BUILD_WORKER_IMAGE: 'Visual Studio 2017', ADDRMDL: 64, TOOLSET: 'msvc-14.1' }
     - { APPVEYOR_BUILD_WORKER_IMAGE: 'Visual Studio 2015', ADDRMDL: 64, TOOLSET: 'msvc-14.0' }
 
-cache:
-  - '%USERPROFILE%\clcache'
-  - '%LOCALAPPDATA%\pip\Cache'
-
 init:
   - set BOOST_ROOT=%APPVEYOR_BUILD_FOLDER%\..\boost
   - set BOOST_BUILD_PATH=%BOOST_ROOT%\..\boost-build
@@ -42,10 +33,6 @@ before_build:
       
       import feature os regex toolset pch ;
       
-      # clcache
-      local toolset = [ regex.split [ os.environ TOOLSET ] "-" ] ;
-      
-      using $(toolset[1]) : $(toolset[2-]:J="-") : : <compiler>clcache ;
       
       # A subfeature that tells Spirit tests to use PCH
       feature.subfeature pch on : version : spirit : optional propagated incidental ;
@@ -78,13 +65,6 @@ before_build:
   - move %APPVEYOR_BUILD_FOLDER% %PROJECT%
   - mklink /J %APPVEYOR_BUILD_FOLDER% %PROJECT%
 
-  # Install clcache
-  - pip install clcache
-  - clcache -M %CLCACHE_CACHESIZE%
-  # Run clcache-server
-  - set CLCACHE_SERVER=1
-  - ps: Start-Process clcache-server.exe -PassThru
-
 build_script:
   - bootstrap.bat --with-toolset=msvc