QT4Macros.cmake: Fix QT4_AUTOMOC (#27113)

macro MACRO_ADD_FILE_DEPENDENCIES was missing.

Change-Id: I0d19052cc1a602331533f14502eda15026c8d1e2
Reviewed-on: http://gerrit.aldebaran.lan/50333
Tested-by: gerrit
Reviewed-by: abossard <abossard@aldebaran-robotics.com>
Reviewed-by: dmerejkowsky <dmerejkowsky@aldebaran-robotics.com>