Add a missing include.

This change is needed to fix the build on Linux. 




git-svn-id: https://llvm.org/svn/llvm-project/llvdb/trunk@127557 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/lldb.cpp b/source/lldb.cpp
index 699c394..061a3d8 100644
--- a/source/lldb.cpp
+++ b/source/lldb.cpp
@@ -10,6 +10,7 @@
 #include "lldb/lldb-private.h"
 #include "lldb/lldb-private-log.h"
 #include "lldb/Core/ArchSpec.h"
+#include "lldb/Core/Debugger.h"
 #include "lldb/Core/Log.h"
 #include "lldb/Core/PluginManager.h"
 #include "lldb/Core/RegularExpression.h"