Add dev-qt from an older version of the gentoo repo

Qt5 has been removed, we restore it since we still use it.

dev-qt/qtsingleapplication/files/2.6.1_p20130904-unbundle-qtlockedfile.patch

@@ -0,0 +1,81 @@
+From 62210d463f87abb0584ce699915e1845cacaa480 Mon Sep 17 00:00:00 2001
+From: Davide Pesavento <davidepesa@gmail.com>
+Date: Sat, 28 Dec 2013 16:33:15 +0100
+Subject: [PATCH] unbundle qtlockedfile
+
+---
+ src/qtlocalpeer.cpp             | 11 +----------
+ src/qtlocalpeer.h               |  2 +-
+ src/qtsingleapplication.pri     |  1 +
+ src/qtsinglecoreapplication.pri |  1 +
+ 4 files changed, 4 insertions(+), 11 deletions(-)
+
+diff --git a/src/qtlocalpeer.cpp b/src/qtlocalpeer.cpp
+index 332b064..f17e662 100644
+--- a/src/qtlocalpeer.cpp
++++ b/src/qtlocalpeer.cpp
+@@ -55,15 +55,6 @@ static PProcessIdToSessionId pProcessIdToSessionId = 0;
+ #include <unistd.h>
+ #endif
+ 
+-namespace QtLP_Private {
+-#include "qtlockedfile.cpp"
+-#if defined(Q_OS_WIN)
+-#include "qtlockedfile_win.cpp"
+-#else
+-#include "qtlockedfile_unix.cpp"
+-#endif
+-}
+-
+ const char* QtLocalPeer::ack = "ack";
+ 
+ QtLocalPeer::QtLocalPeer(QObject* parent, const QString &appId)
+@@ -114,7 +105,7 @@ bool QtLocalPeer::isClient()
+     if (lockFile.isLocked())
+         return false;
+ 
+-    if (!lockFile.lock(QtLP_Private::QtLockedFile::WriteLock, false))
++    if (!lockFile.lock(QtLockedFile::WriteLock, false))
+         return true;
+ 
+     bool res = server->listen(socketName);
+diff --git a/src/qtlocalpeer.h b/src/qtlocalpeer.h
+index 1b533b1..1127735 100644
+--- a/src/qtlocalpeer.h
++++ b/src/qtlocalpeer.h
+@@ -68,7 +68,7 @@ protected:
+     QString id;
+     QString socketName;
+     QLocalServer* server;
+-    QtLP_Private::QtLockedFile lockFile;
++    QtLockedFile lockFile;
+ 
+ private:
+     static const char* ack;
+diff --git a/src/qtsingleapplication.pri b/src/qtsingleapplication.pri
+index 6f2bced..02c9e5b 100644
+--- a/src/qtsingleapplication.pri
++++ b/src/qtsingleapplication.pri
+@@ -3,6 +3,7 @@ INCLUDEPATH += $$PWD
+ DEPENDPATH += $$PWD
+ QT *= network
+ greaterThan(QT_MAJOR_VERSION, 4): QT *= widgets
++CONFIG *= qtlockedfile
+ 
+ qtsingleapplication-uselib:!qtsingleapplication-buildlib {
+     LIBS += -L$$QTSINGLEAPPLICATION_LIBDIR -l$$QTSINGLEAPPLICATION_LIBNAME
+diff --git a/src/qtsinglecoreapplication.pri b/src/qtsinglecoreapplication.pri
+index d2d6cc3..f5b8414 100644
+--- a/src/qtsinglecoreapplication.pri
++++ b/src/qtsinglecoreapplication.pri
+@@ -4,6 +4,7 @@ HEADERS		+= $$PWD/qtsinglecoreapplication.h $$PWD/qtlocalpeer.h
+ SOURCES		+= $$PWD/qtsinglecoreapplication.cpp $$PWD/qtlocalpeer.cpp
+ 
+ QT *= network
++CONFIG *= qtlockedfile
+ 
+ win32:contains(TEMPLATE, lib):contains(CONFIG, shared) {
+     DEFINES += QT_QTSINGLECOREAPPLICATION_EXPORT=__declspec(dllexport)
+-- 
+1.8.5.2
+