qt-tools.cmake: do not call find_package(Qt4)
qt-tools.cmake: do not call find_package(Qt4)

The risk is that upstream CMake module
(in /usr/share/cmake-3.0/Modules/FindQt4.cmake") sets some
qt variables that conflict with the one we set
in our wrapper modules (in qibuild/cmake/qibuild/modules)

Instead, just call ``include(Qt4Macros.cmake)`` directly,
after having looked for uic, moc and rcc.

Change-Id: Iaced1bfa3ae0e55cca0a1a96d5b89821bbc260ec

aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild