Fix reply data can't be decompressed correctly

If the "Accept-Encoding" is not manually specified, it will be
automatically set to the supported encodings by QT and the reply data
will also be automatically decompressed in this case. Setting
"Accept-Encoding" manually will disable the "autodecompress" feature
before QT 6.3.0. Although QT 6.3.x has different behaviors, let QT
specify the "Accept-Encoding" and we will always obtain the decompressed
data.

The macro "QT_NO_COMPRESS" defined when QT is compiled will disable
the zlib support. We can manually address this exceptions.

PR #17438.

src/base/net/downloadmanager.cpp

@@ -123,8 +123,12 @@ namespace
 
         // Spoof HTTP Referer to allow adding torrent link from Torcache/KickAssTorrents
         request.setRawHeader("Referer", request.url().toEncoded().data());
-        // Accept gzip
+#ifdef QT_NO_COMPRESS
+        // The macro "QT_NO_COMPRESS" defined in QT will disable the zlib releated features
+        // and reply data auto-decompression in QT will also be disabled. But we can support
+        // gzip encoding and manually decompress the reply data.
         request.setRawHeader("Accept-Encoding", "gzip");
+#endif
         // Qt doesn't support Magnet protocol so we need to handle redirections manually
         request.setAttribute(QNetworkRequest::RedirectPolicyAttribute, QNetworkRequest::ManualRedirectPolicy);