appveyor: Remove vs2015 jobs

Remove vs2015 jobs, migrated to azure

.appveyor.yml

@@ -1,119 +0,0 @@
-version: '{build}'
-
-os: Visual Studio 2015
-
-environment:
-  matrix:
-    - arch: x86
-      compiler: msvc2015
-      backend: ninja
-      BOOST_ROOT: C:\Libraries\Boost_1_60_0
-
-    - arch: x86
-      compiler: msvc2015
-      backend: vs2015
-      BOOST_ROOT: C:\Libraries\Boost_1_60_0
-
-platform:
-  - x64
-
-branches:
-  only:
-    - master
-    # Release branches
-    - /^[0-9]+\.[0-9]+$/
-
-init:
-  - ps: |
-        If($Env:compiler -like 'msvc2015') {
-          Set-WinSystemLocale de-DE
-          Start-Sleep -s 5
-          Restart-Computer
-        }
-
-install:
-  - ps: |
-        function DownloadFile([String] $Source, [String] $Destination) {
-            $retries = 10
-            for ($i = 1; $i -le $retries; $i++) {
-                try {
-                    (New-Object net.webclient).DownloadFile($Source, $Destination)
-                    break # succeeded
-                } catch [net.WebException] {
-                    if ($i -eq $retries) {
-                        throw # fail on last retry
-                    }
-                    $backoff = (10 * $i) # backoff 10s, 20s, 30s...
-                    echo ('{0}: {1}' -f $Source, $_.Exception.Message)
-                    echo ('Retrying in {0}s...' -f $backoff)
-                    Start-Sleep -m ($backoff * 1000)
-                }
-            }
-        }
-  - cmd: set "ORIG_PATH=%PATH%"
-  # Use a Ninja with QuLogic's patch: https://github.com/ninja-build/ninja/issues/1219
-  - cmd: set "MESON_FIXED_NINJA=1"
-  - ps: DownloadFile -Source 'https://github.com/mesonbuild/cidata/raw/master/ninja.exe' -Destination 'C:\projects\meson\ninja.exe'
-  # Use the x86 python only when building for x86 for the cpython tests.
-  # For all other archs (including, say, arm), use the x64 python.
-  - cmd: if %arch%==x86 (set MESON_PYTHON_PATH=C:\python35) else (set MESON_PYTHON_PATH=C:\python35-x64)
-
-  # Skip CI requires python
-  - cmd: python ./skip_ci.py --base-branch-env=APPVEYOR_REPO_BRANCH --is-pull-env=APPVEYOR_PULL_REQUEST_NUMBER
-
-  # Set paths for BOOST dll files
-  - cmd: if %compiler%==msvc2015 ( if %arch%==x86 ( set "PATH=%PATH%;%BOOST_ROOT%\lib32-msvc-14.0" ) else ( set "PATH=%PATH%;%BOOST_ROOT%\lib64-msvc-14.0" ) )
-  - cmd: if %compiler%==msvc2017 ( if %arch%==x86 ( set "PATH=%PATH%;%BOOST_ROOT%\lib32-msvc-14.1" ) else ( set "PATH=%PATH%;%BOOST_ROOT%\lib64-msvc-14.1" ) )
-
-  # Set paths and config for each build type.
-  - cmd: if %compiler%==msvc2015 ( call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" %arch% )
-  - cmd: if %compiler%==msvc2017 ( call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\Tools\VsDevCmd.bat" -arch=%arch% )
-
-  - cmd: set "PATH=%cd%;%MESON_PYTHON_PATH%;%PATH%;"
-
-  # Setup D compiler and dub packages
-  - ps: |
-        If($Env:compiler.StartsWith('msvc') -and $Env:backend -eq 'ninja') {
-          & .\ci\install-dmd.ps1
-          $arch = 'x86_mscoff'
-          If($Env:arch -eq 'x64') {
-            $arch = 'x86_64'
-          }
-          & dub fetch urld
-          & dub build urld --compiler=dmd --arch=$arch
-          & dub fetch dubtestproject
-          & dub build dubtestproject:test1 --compiler=dmd --arch=$arch
-          & dub build dubtestproject:test2 --compiler=dmd --arch=$arch
-        }
-
-  # pkg-config is needed for the pkg-config tests on msvc
-  - ps: |
-        If($Env:compiler.StartsWith('msvc')) {
-          DownloadFile -Source 'http://nirbheek.in/files/binaries/pkg-config/win32/pkg-config.exe' `
-                       -Destination 'C:\projects\meson\pkg-config.exe'
-        }
-  - ps: |
-        If($Env:compiler -like 'msvc*') {
-          DownloadFile -Source "https://download.microsoft.com/download/D/B/B/DBB64BA1-7B51-43DB-8BF1-D1FB45EACF7A/msmpisdk.msi" `
-                       -Destination "C:\projects\msmpisdk.msi"
-          c:\windows\system32\msiexec.exe /i C:\projects\msmpisdk.msi /quiet
-          DownloadFile -Source "https://download.microsoft.com/download/D/B/B/DBB64BA1-7B51-43DB-8BF1-D1FB45EACF7A/MSMpiSetup.exe" `
-                       -Destination "C:\projects\MSMpiSetup.exe"
-          c:\projects\MSMpiSetup.exe -unattend -full
-        }
-
-build_script:
-  - cmd: echo No build step.
-  - cmd: if %backend%==ninja ( %WRAPPER% ninja.exe --version ) else ( MSBuild /version & echo. )
-
-test_script:
-  - cmd: echo Running tests for %arch% and %compiler% with the %backend% backend
-  - cmd: "%WRAPPER% %PYTHON% run_tests.py --backend=%backend%"
-
-on_finish:
-  - set "PATH=%ORIG_PATH%"
-  - appveyor PushArtifact meson-test-run.txt -DeploymentName "Text test logs"
-  - appveyor PushArtifact meson-test-run.xml -DeploymentName "XML test logs"
-
-cache:
-  - C:\cache