Attempt to fix the phased buildbots by changing rm => sudo rm. During the build process some files were getting spurious permissions. This ensures that those files can be removed, resolving this for now.

git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@198448 91177308-0d34-0410-b5e6-96231b3b80d8