MinGW: Fix warnings about assigned but not used variables.

Change-Id: I114483273db0f9ffe0527b4a3e4cd881375a3448
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Fix MinGW-warnings about narrowing/invalid conversions.

Change-Id: I9b49dd6d12a5e59c6f2674ab3c82a8a7ec583775
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
qsimd: Fix compilation with MinGW 64.

Task-number: QTBUG-34856
Change-Id: Ie1dbeb5787e1a60aeaca585160319bbe0943e2cb
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Kernel: Fix gcc warning in qsharedmemory_win.cpp

Fix gcc 4.7 'arning: converting 'false' to pointer type 'HANDLE {aka void*}' [-Wconversion-null]'

Change-Id: I28d890d5fd4975517a9329d68c9ef73f6fadf36c
Reviewed-by: Qt Doc Bot <qt_docbot@qt-project.org>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
(cherry picked from qtbase/baf8a2fbf710314096832b0ee5735ffdc8b24210)
Make sure .qch file is opened read-only

So far qsqlite tried to open the file first read/write, and falling back
to read access only if this fails. This has resulted in excessively long
loading times e.g. on Windows XP.

Task-number: QTCREATORBUG-10697

(cherry-picked from commit 0bf84aa7873edd7bb411fabb94481b03d1501c68 in
qttools.git)

Change-Id: I94be15e2d7c5845bcadf6b32e54462a7c1bcb98a
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>