Add missing include in FileSpec.

llvm-svn: 297102
diff --git a/lldb/source/Host/common/FileSpec.cpp b/lldb/source/Host/common/FileSpec.cpp
index ef7df3c..10bbea4 100644
--- a/lldb/source/Host/common/FileSpec.cpp
+++ b/lldb/source/Host/common/FileSpec.cpp
@@ -25,6 +25,7 @@
 #include <pwd.h>
 #endif
 
+#include "lldb/Core/StringList.h"
 #include "lldb/Host/FileSpec.h"
 #include "lldb/Host/FileSystem.h"
 #include "lldb/Utility/CleanUp.h"