Drop left-overs from deprecated AppVeyor CI build

appveyor.yml

@@ -1,15 +0,0 @@
-os: Visual Studio 2019
-
-# clone directory
-clone_folder: c:\projects\osrm
-
-platform: x64
-
-# no-op for the time being until someone with access to GitHub checks settings will remove integration with AppVeyor
-# https://github.com/Project-OSRM/osrm-backend/pull/6312#issuecomment-1217237055 
-build_script:
-  - EXIT 0
-
-branches:
-  only:
-    - master

build-local.bat

@@ -1,32 +0,0 @@
-@ECHO OFF
-SETLOCAL
-SET EL=0
-
-ECHO ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ %~f0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-SET PLATFORM=x64
-SET CONFIGURATION=Release
-::SET LOCAL_DEV=1
-
-FOR /F "tokens=*" %%i in ('git rev-parse --abbrev-ref HEAD') do SET APPVEYOR_REPO_BRANCH=%%i
-ECHO APPVEYOR_REPO_BRANCH^: %APPVEYOR_REPO_BRANCH%
-
-SET PATH=C:\Program Files\7-Zip;%PATH%
-
-powershell Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy Unrestricted -Force
-IF %ERRORLEVEL% NEQ 0 GOTO ERROR
-CALL appveyor-build.bat
-IF %ERRORLEVEL% NEQ 0 GOTO ERROR
-
-GOTO DONE
-
-
-:ERROR
-ECHO ~~~~~~~~~~~~~~~~~~~~~~ ERROR %~f0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-ECHO ERRORLEVEL^: %ERRORLEVEL%
-SET EL=%ERRORLEVEL%
-
-:DONE
-ECHO ~~~~~~~~~~~~~~~~~~~~~~ DONE %~f0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-EXIT /b %EL%