Add upstream patch to fix the build with the upcoming Qt 5.5.1.

svn path=/head/; revision=406859

mail/trojita/files/patch-git_8a2496c2

@@ -0,0 +1,30 @@
+commit 8a2496c273f2b0034f0edcc525e4987938a86c50
+Author: Jan Kundrát <jkt@kde.org>
+Date:   Tue Mar 10 14:41:20 2015 +0100
+
+    Fix build with (unreleased) Qt 5.5
+
+    It is our fault for not including the headers we need, of course.
+
+    Change-Id: Ibaa1df4a8b763bf6ae611c85cbdeeac5d2e3f9fd
+
+--- src/AbookAddressbook/AbookAddressbook.h
++++ src/AbookAddressbook/AbookAddressbook.h
+@@ -25,6 +25,7 @@
+ #ifndef ABOOK_ADDRESSBOOK
+ #define ABOOK_ADDRESSBOOK
+ 
++#include <QObject>
+ #include <QPair>
+ #include "Gui/AbstractAddressbook.h"
+ 
+--- src/Imap/Model/MailboxMetadata.cpp
++++ src/Imap/Model/MailboxMetadata.cpp
+@@ -20,6 +20,7 @@
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+ #include "MailboxMetadata.h"
++#include <QDataStream>
+ 
+ namespace Imap
+ {