Ensure that squish works with installer framework

Installer framework version 4.4.0 is built with squish hooks enabled (squish version 6.7.2). Make sure the squish tools can be attached to the installer framework squish hooks. For testing QtInstallerFramework-<platform>-<archive>-4.4.0(.run/.exe/.dmg) can be used from http://ci-files02-hki.intra.qt.io/packages/jenkins/installer-framework/master/latest/installer-framework/Linux-RHEL_7_6-GCC-Linux-RHEL_7_6-X86_64/ http://ci-files02-hki.intra.qt.io/packages/jenkins/installer-framework/master/latest/installer-framework/MacOS-MacOS_10_13-Clang-MacOS-MacOS_10_13-X86_64/ http://ci-files02-hki.intra.qt.io/packages/jenkins/installer-framework/master/latest/installer-framework/Windows-Windows_10-MSVC2015-Windows-Windows_10-X86/