Project tests: Also catch ValueError
Project tests: Also catch ValueError

It seems on Windows, deleting in a loop can cause a race where the
following error is raised:

Traceback (most recent call last):
  File "run_project_tests.py", line 550, in <module>
    (passing_tests, failing_tests, skipped_tests) = run_tests(all_tests, 'meson-test-run', options.extra_args)
  File "run_project_tests.py", line 416, in run_tests
    result = result.result()
  File "C:\python34-x64\lib\concurrent\futures\_base.py", line 402, in result
    return self.__get_result()
  File "C:\python34-x64\lib\concurrent\futures\_base.py", line 354, in __get_result
    raise self._exception
ValueError: I/O operation on closed file.

https://ci.appveyor.com/project/jpakkane/meson/build/1.0.1559/job/vsek754eu000kg3e

mesonbuild/meson,QuLogic/meson,ernestask/meson,MathieuDuponchelle/meson,thiblahute/meson,mesonbuild/meson,pexip/meson,becm/meson,becm/meson,QuLogic/meson,thiblahute/meson,fmuellner/meson,becm/meson,rhd/meson,QuLogic/meson,aaronp24/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson,aaronp24/meson,aaronp24/meson,ernestask/meson,MathieuDuponchelle/meson,QuLogic/meson,ernestask/meson,fmuellner/meson,wberrier/meson,wberrier/meson,wberrier/meson,jeandet/meson,mesonbuild/meson,QuLogic/meson,rhd/meson,trhd/meson,mesonbuild/meson,mesonbuild/meson,pexip/meson,jpakkane/meson,pexip/meson,rhd/meson,pexip/meson,rhd/meson,trhd/meson,fmuellner/meson,wberrier/meson,pexip/meson,jpakkane/meson,trhd/meson,rhd/meson,fmuellner/meson,MathieuDuponchelle/meson,becm/meson,aaronp24/meson,jeandet/meson,thiblahute/meson,jpakkane/meson,jeandet/meson,wberrier/meson,trhd/meson,trhd/meson,becm/meson,pexip/meson,jpakkane/meson,thiblahute/meson,becm/meson,fmuellner/meson,fmuellner/meson,fmuellner/meson,QuLogic/meson,ernestask/meson,pexip/meson,MathieuDuponchelle/meson,MathieuDuponchelle/meson,MathieuDuponchelle/meson,jeandet/meson,becm/meson,ernestask/meson,aaronp24/meson,aaronp24/meson,jpakkane/meson,becm/meson,jeandet/meson,trhd/meson,MathieuDuponchelle/meson,wberrier/meson,QuLogic/meson,thiblahute/meson,wberrier/meson,thiblahute/meson,mesonbuild/meson,QuLogic/meson,rhd/meson,MathieuDuponchelle/meson,aaronp24/meson,ernestask/meson,pexip/meson,jpakkane/meson,trhd/meson,jeandet/meson,wberrier/meson,QuLogic/meson,fmuellner/meson,thiblahute/meson,pexip/meson,jeandet/meson,trhd/meson,becm/meson,thiblahute/meson,jeandet/meson,jpakkane/meson,ernestask/meson,aaronp24/meson,mesonbuild/meson,jpakkane/meson,becm/meson,ernestask/meson,ernestask/meson,thiblahute/meson,rhd/meson,fmuellner/meson,aaronp24/meson,rhd/meson,jpakkane/meson,mesonbuild/meson,jeandet/meson,MathieuDuponchelle/meson,trhd/meson