Fix first regression introduced with r55173: need to import shutil before using methods from it
Otherwise linux buildbot fails dramatically.

That revision also leads to msvc runtime libs being removed, will fix this
in separate commit.

Take more respect for such creepy as linux and windows platforms, they're not so bad!

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55187 954f8c5b-7b00-dc11-b283-0030488c597c