Add Qt and XCB compile version to supportInformation
Review Request #122375 - Created Feb. 2, 2015 and submitted
Add QT_VERSION_STR in addition to qVersion(). This could be useful to see whether the runtime version is different to the Qt version used at compile time. Also adds the XCB_VERSION_STRING which is used at compile time. This is useful as for example XCB::SYNC was broken prior to 1.10.