Added convenience methods to QJsonArray for appending QJsonValues

operators for +, +=, and << were added to QJsonArray to make
it easier to work with, and more closely resemble the Qt
container classes

[ChangeLog][QtCore][QJsonArray] Added convenience methods to QJsonArray for appending QJsonValues

Change-Id: I96e0a43015f7c0f980cbbef7f20bd2085ee04795
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Added constructor to QJsonValue for const char *

For convenience, it reads more easily (and is somewhat expected) to
be able to add a string to a QJsonArray like you might with a
QVariantList: QJsonArray() << "string". Previously, QJsonValue provided
a private void* ctor to explicitly deny this case because it would
implicitly convert to a boolean. This ctor provides a const char* ctor
(much like QVariant) that interprets the incoming text as utf8 and
creates a String type QJsonValue.

[ChangeLog][QtCore][QJsonValue] Added constructor to QJsonValue for const char *

Change-Id: Icafa954d3da1fb264f9d0fd7cd1a1d2fbbe15095
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
iOS: Prevent trying to use both libc++ and libstdc++

Static builds of Qt will automatically enable C++11 for all projects,
but this happens in mac/default_post which is after our check.

Change-Id: I22a01e5d876242263fa31f8a404a65905c6c1877
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Remove last traces of QT_COMPILER_SUPPORTS_NEON

Fixes ARM build, as the NEON drawhelpers and image conversion functions
were ifdef'ed out.

Follow-up to 1b12c0608be2359baa2f96ae28b135a84abd388c.

Change-Id: I0b5e89c8f445741432db2dfe1f8d971b971c8605
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
iOS: Don't try to use NEON drawhelpers, we don't build them

On iOS we don't build the NEON drawhelpers as they are implemented using
GAS syntax assembly, so prevent drawhelpers.cpp from trying to use them.

Follow-up to 01c59ac857927043e49d4725062faea715ed49a3.

Change-Id: I3e3dc9b0e1d780db3184413d2ff3010ac8dcd37b
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>