Suppress libpng errors.

src/gui/control/image_card_list.cpp

@@ -14,6 +14,7 @@
 #include <data/card.hpp>
 #include <gfx/gfx.hpp>
 #include <wx/imaglist.h>
+#include <gui/util.hpp>
 
 DECLARE_TYPEOF_COLLECTION(FieldP);
 
@@ -62,7 +63,7 @@ class CardThumbnailRequest : public ThumbnailRequest {
     try {
       ImageCardList* parent = (ImageCardList*)owner;
       Image image;
-      if (image.LoadFile(*parent->set->openIn(filename))) {
+      if (image_load_file(image, *parent->set->openIn(filename))) {
         // two step anti aliased resampling
         image.Rescale(36, 28); // step 1: no anti aliassing
         return resample(image, 18, 14); // step 2: with anti aliassing

src/gui/control/package_list.cpp

@@ -11,6 +11,7 @@
 #include <util/io/package_manager.hpp>
 #include <util/alignment.hpp>
 #include <script/profiler.hpp>
+#include <gui/util.hpp>
 
 DECLARE_TYPEOF_COLLECTION(PackagedP);
 
@@ -75,7 +76,7 @@ void PackageList::showData(const String& pattern) {
     InputStreamP stream = p->openIconFile();
     Image img;
     Bitmap bmp;
-    if (stream && img.LoadFile(*stream)) {
+    if (stream && image_load_file(img, *stream)) {
       bmp = Bitmap(img);
     }
     // add to list