[lldb/Plugins] Fix SWIGPythonBridge build issue

This patch should fi the build issue on the windows bots:
https://lab.llvm.org/buildbot/#/builders/83/builds/4214/steps/5/logs/stdio

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>

Author: medismailben

lldb/source/Plugins/ScriptInterpreter/Python/SWIGPythonBridge.h

@@ -9,6 +9,8 @@
 #ifndef LLDB_PLUGINS_SCRIPTINTERPRETER_PYTHON_SWIGPYTHONBRIDGE_H
 #define LLDB_PLUGINS_SCRIPTINTERPRETER_PYTHON_SWIGPYTHONBRIDGE_H
 
+#include <string>
+
 #include "lldb/Host/Config.h"
 
 #if LLDB_ENABLE_PYTHON