Changes: removed deprecated qmake variable
Changes: removed deprecated qmake variable

RevBy: TrustMe
Details: QMAKE_EXTRA_UNIX_TARGETS -> QMAKE_EXTRA_TARGETS

KDE/plasma-maliit-plugins,maliit/plugins,develersrl/maliit-demo-qml,KDE/plasma-maliit-plugins,RHawkeyed/plugins,KDE/plasma-maliit-plugins,KDE/plasma-maliit-plugins,maliit/plugins,maliit/plugins,RHawkeyed/plugins,develersrl/maliit-demo-qml,RHawkeyed/plugins,maliit/plugins,RHawkeyed/plugins,develersrl/maliit-demo-qml,develersrl/maliit-demo-qml,RHawkeyed/plugins