don't use QT_{BEGIN,END}_INCLUDE_NAMESPACE needlessly

don't use QT_{BEGIN,END}_INCLUDE_NAMESPACE needlessly

these macros behave counter-intuitively, so don't use them unless the code
structure really suggests their use.

Change-Id: I58213b39f8a98e4368901217fac14ca49c28b8cf
Reviewed-by: hjk <qthjk@ovi.com>