eliminate some clang warnings.

llvm-svn: 113438
diff --git a/lldb/source/Host/macosx/Symbols.cpp b/lldb/source/Host/macosx/Symbols.cpp
index 3502ff5..13c2c2d 100644
--- a/lldb/source/Host/macosx/Symbols.cpp
+++ b/lldb/source/Host/macosx/Symbols.cpp
@@ -25,6 +25,7 @@
 #include "lldb/Core/UUID.h"
 
 #include "Host/macosx/cfcpp/CFCReleaser.h"
+#include "mach/machine.h"
 
 using namespace lldb;
 using namespace lldb_private;