Add missing #include.  This should fix the Windows build.

llvm-svn: 230128
diff --git a/lldb/source/Host/windows/Host.cpp b/lldb/source/Host/windows/Host.cpp
index 7f70596..38dc252 100644
--- a/lldb/source/Host/windows/Host.cpp
+++ b/lldb/source/Host/windows/Host.cpp
@@ -20,6 +20,7 @@
 #include "lldb/Target/Process.h"
 
 #include "lldb/Host/Host.h"
+#include "lldb/Host/HostInfo.h"
 #include "lldb/Core/DataBufferHeap.h"
 #include "lldb/Core/DataExtractor.h"
 #include "lldb/Core/StreamFile.h"