fix build on debian squeeze

Author: jef-n

src/analysis/raster/qgsninecellfilter.cpp

@@ -18,6 +18,7 @@
 #include "qgsninecellfilter.h"
 #include "cpl_string.h"
 #include <QProgressDialog>
+#include <QFile>
 
 #if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM >= 1800
 #define TO8F(x) (x).toUtf8().constData()