The generated path with the packages uses $CPACK_TOPLEVEL_TAG, which
by default is $CPACK_SYSTEM_NAME, thus the OS name.
To make the expected stderr match also non-Linux OSes, accept any
non-slash characters in place of "Linux", so it works also on other
Debian OSes (e.g. Debian/Hurd).
Every CPack generator sets default CPACK_PACKAGING_INSTALL_PREFIX
variable value differently so test framework should support
that correctly - previous version expected RPM/Deb /usr default and
removed it for Archive packagers as the default there is /.
CPack tests can now define one or more
packaging types and that test will be
executed once per generator per packaging
type. This also enables us to set default
values per packaging type for each generator
which makes tests shorter.
Pino Toscano