tests: conditonalize a Windows only output in test-evolve-progress.t

--HG--
branch : stable
7 jobs for topic/stable/windows-fix in 6 minutes and 17 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed doc #107329

00:00:29

passed flake8 #107323

00:01:01

manual pytype #107324
allowed to fail manual
passed tests-py2-cext #107325

00:03:28

passed tests-py2-pure #107326

00:02:37

passed tests-py3-cext #107327

00:06:03

passed tests-py3-pure #107328

00:05:13