Remove unused AppVeyor file

.appveyor.yml

@@ -1,58 +0,0 @@
-environment:
-    DEPS_DIR: c:\\projects\dependencies
-    DEPS_BRANCH: master
-    ASSETS_DIR: c:\\projects\stk-assets
-    APPVEYOR_CACHE_ENTRY_ZIP_ARGS: -t7z -m0=lzma2 -mx=9
-
-os: Visual Studio 2015
-clone_depth: 1
-shallow_clone: true
-
-platform:
-    # - x86
-    - x64
-
-configuration:
-    - Debug
-    - Release
-
-matrix:
-    fast_finish: true
-
-#cache:
-#    - '%DEPS_DIR%'
-    #- '%ASSETS_DIR%'
-
-install:
-    - ps: >-
-        If(!(Test-Path "$env:DEPS_DIR")) {
-            Write-Host "Downloading dependencies";
-            Start-Process -FilePath "git" -ArgumentList "clone --branch $env:DEPS_BRANCH --single-branch --depth 1 https://github.com/supertuxkart/dependencies.git $env:DEPS_DIR" -Wait;
-        }
-        Else {
-            Write-Host "Updating dependencies";
-            Start-Process -FilePath "git" -ArgumentList "fetch --depth 1" -WorkingDirectory "$env:DEPS_DIR" -Wait;
-        }
-        Get-ChildItem $env:DEPS_DIR | Measure-Object -property length -sum
-        #- ps: >-
-        #If(!(Test-Path "$env:ASSETS_DIR")) {
-        #    Write-Host "Downloading assets";
-        #    Start-Process -FilePath "svn" -ArgumentList "checkout https://svn.code.sf.net/p/supertuxkart/code/stk-assets $env:ASSETS_DIR" -Wait;
-        #}
-        #Else {
-        #    Write-Host "Updating assets";
-        #    Start-Process -FilePath "svn" -ArgumentList "update" -WorkingDirectory "$env:ASSETS_DIR" -Wait;
-        #}
-        #Get-ChildItem $env:ASSETS_DIR | Measure-Object -property length -sum
-
-before_build:
-    - ps: Copy-Item "${env:DEPS_DIR}\windows_64bit\dependencies" c:\projects\stk-code\dependencies-64bit –Recurse
-    - cmd: |
-        md build
-        cd build
-        if "%platform%"=="x64" set CMAKE_GENERATOR_NAME="Visual Studio 14 2015 Win64"
-        cmake -G %CMAKE_GENERATOR_NAME% -DCMAKE_BUILD_TYPE="%configuration%" .. -DCHECK_ASSETS=OFF
-
-build:
-    parallel: true
-    project: build\ALL_BUILD.vcxproj