Revert "[lit] Speculatively fix PR24554 by manually closing the process handle"

This reverts commit r245946. It didn't help the problem:
http://lab.llvm.org:8011/builders/sanitizer-windows/builds/9179/steps/run%20tests/logs/stdio
LINK : fatal error LNK1104: cannot open file

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@246491 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed