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3a78eca9 - msgfilter: Pass previous msgid to the child process

msgfilter: Pass previous msgid to the child process Suggested by Pavel Kharitonov in: <http://lists.gnu.org/archive/html/bug-gettext/2014-05/msg00022.html>. * msgfilter.c (process_message): Set MSGFILTER_PREV_* envvar.