Remove qmake warning

Change-Id: I2514a2c3a5f26ec5ae3ef2f5808353c7b3e0aed8
Reviewed-on: http://codereview.qt-project.org/5538

Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Tim Jenssen <tim.jenssen@nokia.com>
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

src/plugins/updateinfo/updateinfo.pro

@@ -3,7 +3,6 @@ TEMPLATE = lib
 QT += network xml
 
 HEADERS += updateinfoplugin.h \
-    updateinfo_global.h \
     updateinfobutton.h
 SOURCES += updateinfoplugin.cpp \
     updateinfobutton.cpp