Delete old coverity files

CI/msvc/build_script.bat

@@ -1,6 +0,0 @@
-cd %APPVEYOR_BUILD_FOLDER%
-cd build_%VCMI_BUILD_PLATFORM%
-
-cmake --build . --config %VCMI_BUILD_CONFIGURATION% -- /maxcpucount:2
-
-cpack

CI/msvc/coverity_build_script.bat

@@ -1,5 +0,0 @@
-cd %APPVEYOR_BUILD_FOLDER%
-cd build_%VCMI_BUILD_PLATFORM%
-
-echo Building with coverity...
-cov-build.exe --dir cov-int cmake --build . --config %VCMI_BUILD_CONFIGURATION% -- /maxcpucount:2

CI/msvc/coverity_upload_script.ps

@@ -1,17 +0,0 @@
-7z a "$Env:APPVEYOR_BUILD_FOLDER\$Env:APPVEYOR_PROJECT_NAME.zip" "$Env:APPVEYOR_BUILD_FOLDER\build_$Env:VCMI_BUILD_PLATFORM\cov-int\"
-
-# cf. http://stackoverflow.com/a/25045154/335418
-Remove-item alias:curl
-
-Write-Host "Uploading Coverity analysis result..." -ForegroundColor "Green"
-
-curl --silent --show-error `
-     --output curl-out.txt `
-     --form token="$Env:coverity_token" `
-     --form email="$Env:coverity_email" `
-     --form "file=@$Env:APPVEYOR_BUILD_FOLDER\$Env:APPVEYOR_PROJECT_NAME.zip" `
-     --form version="$Env:APPVEYOR_REPO_COMMIT" `
-     --form description="CI server scheduled build." `
-     https://scan.coverity.com/builds?project=vcmi%2Fvcmi
-
-cat .\curl-out.txt