Remove the skeleton target, it doesn't produce useful code and there are

Remove the skeleton target, it doesn't produce useful code and there are
other small targets that do that can be learned from.  They also have
the added advantage of being tested :)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26243 91177308-0d34-0410-b5e6-96231b3b80d8