qtbase: Replace 0012-qtbase-allow-build-of-examples.patch with -compile-examples...

qtbase: Replace 0012-qtbase-allow-build-of-examples.patch with -compile-examples option

* -compile-examples option was added in upstream commit:
  commit 8ea19caacf281240411541b5af37c2f9a103a7d1
  Author: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
  Date:   Tue May 7 17:10:22 2013 +0200
  Subject: add -compile-examples configure option

(From meta-qt5 rev: a036792a6270f18c971baeb72f92abbb91c4d73e)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>