Fix compilation with Qt 4.8's QStringBuilder
Fix compilation with Qt 4.8's QStringBuilder

Signed-off-by: Bartosz Brachaczek <115ce0e04ebcd35f3accd21d84a595d467c5c771@gmail.com>

drizt/iris,orgads/iris,psi-im/iris,psi-im/iris,psi-im/iris,harishnavnit/iris,harishnavnit/iris,harishnavnit/iris,orgads/iris,orgads/iris,drizt/iris,drizt/iris