Make things compile with the printer feature disabled

Always include qtprintsupportglobal.h before checking the
ifdef, and add ifdef's where they where missing.

Change-Id: I535dce33b26955fb0196ea05d54be41fe93e9151
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>