Replace some more c headers with c++ headers

src/app/dwg/libdxfrw/drw_header.cpp

@@ -19,7 +19,7 @@
 #include "qgslogger.h"
 #include <QStringList>
 
-#include <assert.h>
+#include <cassert>
 
 DRW_Header::DRW_Header()
   : curr( nullptr )

src/app/qgsattributetabledialog.h

@@ -21,7 +21,7 @@
 #include <QModelIndex>
 #include <QItemSelectionModel>
 
-#include <time.h>
+#include <ctime>
 
 #include "ui_qgsattributetabledialog.h"
 #include "qgssearchwidgetwrapper.h"

src/core/qgis.h

@@ -28,7 +28,7 @@
 #include <QDate>
 #include <QTime>
 #include <QHash>
-#include <stdlib.h>
+#include <cstdlib>
 #include <cfloat>
 #include <cmath>
 #include <qnumeric.h>

src/providers/virtual/qgsvirtuallayersqlitemodule.cpp

@@ -16,7 +16,7 @@ email                : hugo dot mercier at oslandia dot com
 
 #include <string.h>
 #include <iostream>
-#include <stdint.h>
+#include <cstdint>
 #include <stdexcept>
 
 #include <QCoreApplication>
@@ -31,7 +31,7 @@ email                : hugo dot mercier at oslandia dot com
 #include "qgsinterval.h"
 #include <sqlite3.h>
 #include <spatialite.h>
-#include <stdio.h>
+#include <cstdio>
 #include "qgsvirtuallayersqlitemodule.h"
 #include "qgsvirtuallayerblob.h"
 #include "qgsslottofunction.h"

src/server/qgsmslayercache.h

@@ -21,7 +21,7 @@
 #define SIP_NO_FILE
 
 
-#include <time.h>
+#include <ctime>
 #include <QFileSystemWatcher>
 #include <QMultiHash>
 #include <QObject>