Handle INCLUDE and LIB environment variables in config.tests for MinGW

Fix ICU compile test for MinGW by adding the INCLUDE and LIB environment
variables to the compiler flags. The logic is the same as in qmodule.pri.

Task-number: QTBUG-34971
Change-Id: I192e06643517087587ec4a5dffe4698c2078011a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
iOS: Fix linking against QtCore

After introducing support for QSysInfo::macVersion() for iOS we need
clients to link to UIKit when using QtCore, as that's where the UIDevice
class lives.

Change-Id: I0a9c2e2506c61ac5619fd000ebd10c2ab9e037cf
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Fix race condition between destruction of QObjects

If the two QObjecs are connected and destroyed at the same time, it
is possible to hit a case where QObject::metaObject and QObject::disconnectNotify
is called on a destroyed object.

This patch moves the calls up before the removal of the connection. This
ensure the sender object will have to block on the receivers connection
mutex and can not finish destruction before disconnectNotify is called.

Task-number: QTBUG-34131
Change-Id: I398116fe7bc6a195991aff9961d89a8b0ac8d53c
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>