Bump the minimum required PCRE version to 8.31

This allows us to use JIT also for partial matching.

Change-Id: I3963a03e769c61ab68d28c617cbeee2bc49c8f9b
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
QRegularExpression: enable JIT study for partial matching too

Task-number: QTBUG-38034
Change-Id: I0edc1c0b5e3be5fd12a91007b68e5eff7ccc7e40
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
QRegularExpression: update the error strings to the ones in PCRE 8.35

Change-Id: Iee03fff5971712c3eb51a32d632cb1a6c276699c
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Load qt_installs in platformheaders

Change-Id: I82098e7633d6153c7157bb2d4e9feeef376f53bc
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
Remove direct OpenGL calls from QtOpenGL

Task-number: QTBUG-36483
Change-Id: I96dea5649c0a49a11cd2ff31da659cd2067e769d
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Removed unused function qcolorFromCGColor() in qmacstyle_mac.mm.

Change-Id: Id001ff3087e7317bbcd66cd22a91a4a67942567f
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Removed unused function stringSize() in qmetaobject.cpp.

Change-Id: I56e90d2cdd736aaa0ea1e7f6abde958c77fe0d32
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@digia.com>
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Fixed i18n in QImageReader/QImageWriter.

Change-Id: I366831e23e4d29999696872d752b9487d1f22d44
Reviewed-by: Andy Shaw <andy.shaw@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>