CI: removed azure pipelines

we are now fully converted to github actions for cygwin binaries

.azure/azure-pipelines.yml

@@ -1,33 +0,0 @@
-jobs:
-- job: sitl
-  displayName: 'Cygwin SITL build'
-  pool:
-    vmImage: 'windows-latest'
-  steps:
-  - script: choco install cygwin --params "/InstallDir:C:\Cygwin /NoStartMenu /NoAdmin"
-    displayName: 'Install Cygwin'
-
-  - script: choco install cygwin32-gcc-g++ python36 python36-future python36-lxml python36-pip python36-setuptools python36-wheel git libexpat procps gettext --source cygwin
-    displayName: 'Install Cygwin packages'
-  - script: C:\Cygwin\bin\bash --login -c "cd $(cygpath '%BUILD_SOURCESDIRECTORY%') && git submodule update --recursive --init --depth 2"
-    displayName: Initialize submodules
-
-  - script: C:\Cygwin\bin\bash --login -c "ln -sf /usr/bin/python3.6 /usr/bin/python && ln -sf /usr/bin/pip3.6 /usr/bin/pip"
-    displayName: 'Make Python 3.6 the default Python'
-
-  - script: C:\Cygwin\bin\bash --login -c "cd $(cygpath '%BUILD_SOURCESDIRECTORY%') &&
-                                           mkdir artifacts &&
-                                           (./waf --color yes --toolchain i686-pc-cygwin --board sitl configure bin 2>&1) | tee artifacts/build.txt"
-    displayName: 'Build SITL'
-
-  - script: C:\Cygwin\bin\bash --login -c "cd $(cygpath '%BUILD_SOURCESDIRECTORY%') &&
-                                           cp -v build/sitl/bin/* artifacts/ &&
-                                           cp -v $(i686-pc-cygwin-g++ -print-sysroot)/usr/bin/*.dll artifacts/ &&
-                                           git log -1 > artifacts/git.txt"
-    displayName: 'Copy dependencies to build dir'
-
-  - task: PublishBuildArtifacts@1
-    displayName: 'Publish build artifacts'
-    inputs:
-      artifactName: 'Cygwin SITL binaries'
-      pathtoPublish: 'artifacts'