Update libchamplain to 0.12.8. Kill keepla. Bump users of
libchamplain (eog-plugins and empathy) and remove keepla
from those too. Do some INSTALL_TARGET=install-strip here
and there.


git-svn-id: svn://creme-brulee.marcuscom.com/ports/trunk@19762 df743ca5-7f9a-e211-a948-0013205c9059