ifdefing out the signal handling code on Windows
ifdefing out the signal handling code on Windows

*fingers crossed*

This might fix the Window bots, but I really don't know...

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@300636 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb