Remove warning about missing file.

The file is created only at qmake run.

Change-Id: Ie3e07ee6e66aeb660a8bf9960e4ff198851c19a8
Reviewed-on: http://codereview.qt.nokia.com/2433Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Daniel Molkentin <daniel.molkentin@nokia.com>

src/libs/utils/utils-lib.pri

@@ -103,7 +103,6 @@ unix:!macx {
     SOURCES += $$PWD/unixutils.cpp
 }
 HEADERS += \
-    $$PWD/app_version.h \
     $$PWD/environment.h \
     $$PWD/environmentmodel.h \
     $$PWD/qtcprocess.h \