Add headers necessary to compile with g++ 4.3 (I am not sure about the typeinfo, the others are clearly correct).

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@23862 a592a061-630c-0410-9148-cb99ea01b6c8

src/TextMetrics.cpp

@@ -49,7 +49,7 @@
 #include "frontends/Painter.h"
 
 #include "support/debug.h"
-
+#include <cstdlib>
 #include <boost/assert.hpp>
 
 using namespace std;

src/support/docstring.cpp

@@ -18,6 +18,7 @@
 
 #include <locale>
 #include <iostream>
+#include <typeinfo>
 
 #include <QFile>
 

src/tex2lyx/tex2lyx.cpp

@@ -26,6 +26,7 @@
 #include "support/os.h"
 #include "support/Package.h"
 
+#include <cstdlib>
 #include <fstream>
 #include <iostream>
 #include <string>