[Qt][WK1] navigator.plugins shows too few entries.

Backport r153517 from webkit trunk and Qt 5 to Qt 4.8.

https://bugs.webkit.org/show_bug.cgi?id=119332

Reviewed by Jocelyn Turcotte.

Based on input by Choon Sik Cho.

WebPlatformStrategies::getPluginInfo was using the
WTF::Vector::resize method wrongly.

This patch removes the call to Vector::resize as
Vector::append will take care of increasing capacity
if needed.

* WebCoreSupport/WebPlatformStrategies.cpp:
(WebPlatformStrategies::getPluginInfo):

Task-Number: QTBUG-30141
Change-Id: Ief250ee98c4c5d2cb5165d6da3d7b43c54cbd7c8
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>
configure: Add QtConcurrent support for Sun CC 5.1x

It compiles and demos run without crashing.

Change-Id: I570a0855ec4fc5673e45580bfdbc387cf86680d0
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>