Small inclusion fixes.

 * Remove duplicate headers.
 * Move own headers to the top.

Reviewed-by: Roberto Raggi

src/libs/cplusplus/SimpleLexer.cpp

@@ -27,9 +27,10 @@
 **
 **************************************************************************/
 
-#include "ObjectiveCTypeQualifiers.h"
 #include "SimpleLexer.h"
 
+#include "ObjectiveCTypeQualifiers.h"
+
 #include <Lexer.h>
 #include <Token.h>
 #include <QtDebug>

src/libs/cplusplus/TypePrettyPrinter.cpp

@@ -27,8 +27,9 @@
 **
 **************************************************************************/
 
-#include "Overview.h"
 #include "TypePrettyPrinter.h"
+
+#include "Overview.h"
 #include <FullySpecifiedType.h>
 #include <Literals.h>
 #include <CoreTypes.h>

src/libs/cplusplus/pp-engine.cpp

@@ -56,7 +56,6 @@
 
 #include <QtDebug>
 #include <algorithm>
-#include <cctype>
 
 namespace CPlusPlus {
 

src/libs/cplusplus/pp-macro-expander.cpp

@@ -27,9 +27,10 @@
 **
 **************************************************************************/
 
+#include "pp-macro-expander.h"
+
 #include "pp.h"
 #include "pp-cctype.h"
-#include "pp-macro-expander.h"
 #include <QDateTime>
 
 namespace CPlusPlus {