Remove these dependencies that are not used.

--- a/rssguard.pro
+++ b/rssguard.pro
@@ -164,7 +164,7 @@ message(rssguard: Prefix directory: \"$$PREFIX\".)
 message(rssguard: Build revision: \"$$APP_REVISION\".)
 message(rssguard: lrelease executable name: \"$$LRELEASE_EXECUTABLE\".)
 
-QT += core gui widgets sql network xml printsupport
+QT += core gui widgets sql network xml
 
 CONFIG *= c++11 debug_and_release warn_on
 DEFINES *= QT_USE_QSTRINGBUILDER QT_USE_FAST_CONCATENATION QT_USE_FAST_OPERATOR_PLUS UNICODE _UNICODE
diff --git a/src/miscellaneous/systemfactory.cpp b/src/miscellaneous/systemfactory.cpp
index da35aba..1d6b2cd 100755
--- a/src/miscellaneous/systemfactory.cpp
+++ b/src/miscellaneous/systemfactory.cpp
@@ -35,7 +35,6 @@
 #include <QFileInfo>
 #include <QDir>
 #include <QFutureWatcher>
-#include <QtConcurrent/QtConcurrentRun>
 #include <QDesktopServices>