Update appdata-tools to 0.18.0. Say also 'Hello!' to appstream-glib, which
is needed by appdata-tools.

For both ports, ensure NOCONFIGURE=yes is set by using ${SETENV}

For appstream-glib, remove libarchive from the configure.ac and add -larchive
to the LDFLAGS to use the version we have in base.


git-svn-id: svn://creme-brulee.marcuscom.com/ports/trunk@20006 df743ca5-7f9a-e211-a948-0013205c9059