Update po/*/Makefile.in.in to that provided by gettext-tools 0.19.8.
* From now on, gettext 0.18.0 or later will be required to update catalog (i.e. msgmerge has to have --lang option). * Makefile.in.in should not be modified: Customization should be done by editing Makevars (and xgettext.pl). * DIST_DEPENDS_ON_UPDATE_PO was set to "no", i.e. "make dist" won't force updating *.pot.