Add Qt 6 support

Tested only on Linux so far

Telegram/SourceFiles/storage/localimageloader.cpp

@@ -15,7 +15,6 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "core/mime_type.h"
 #include "base/unixtime.h"
 #include "base/random.h"
-#include "base/qt_adapters.h"
 #include "editor/scene/scene.h" // Editor::Scene::attachedStickers
 #include "media/audio/media_audio.h"
 #include "media/clip/media_clip_reader.h"
@@ -35,6 +34,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include <QtCore/QBuffer>
 #include <QtGui/QImageWriter>
+#include <QtGui/QColorSpace>
 
 namespace {
 
@@ -864,7 +864,7 @@ void FileLoadTask::process(Args &&args) {
 					// We have an example of dark .png image that when being sent without
 					// removing its color space is displayed fine on tdesktop, but with
 					// a light gray background on mobile apps.
-					base::QClearColorSpace(full);
+					full.setColorSpace(QColorSpace());
 					QBuffer buffer(&filedata);
 					QImageWriter writer(&buffer, "JPEG");
 					writer.setQuality(87);