bpo-33764: Appveyor fixes (pythonGH-7364)

* Prevent spurious message if taking a shortcut * Fix YAML style * Disable largefile tests

Author: zware

.github/appveyor.yml

@@ -20,18 +20,19 @@ before_build:
  If (!$changes) {
  echo 'Only docs were updated, stopping build process.'
  Exit-AppveyorBuild
+ } else {
+ echo 'Doing full build due to non-doc changes in these files:'
+ echo $changes
  }
- echo 'Doing full build due to non-doc changes in these files:'
- echo $changes
  }
 
 
 build_script:
  - cmd: PCbuild\build.bat -e
  - cmd: PCbuild\win32\python.exe -m test.pythoninfo
 test_script:
- - cmd: PCbuild\rt.bat -q -uall -u-cpu -rwW --slowest --timeout=1200 --fail-env-changed -j0
+ - cmd: PCbuild\rt.bat -q -uall -u-cpu -u-largefile -rwW --slowest --timeout=1200 --fail-env-changed -j0
 environment:
  HOST_PYTHON: C:\Python36\python.exe
 image:
-- Visual Studio 2017
+ - Visual Studio 2017