po: Preserve the previous msgid on change as a hint to translators.
diff --git a/configure.ac b/configure.ac
index 3fd320e..27db29c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3107,7 +3107,7 @@
WINE_APPEND_RULE([ALL_MAKEFILE_DEPENDS],
[ALL_POT_FILES =$ALL_POT_FILES
\$(LINGUAS:%=po/%.po): \$(srcdir)/po/wine.pot
- msgmerge -q \$[@] \$(srcdir)/po/wine.pot | msgattrib --no-obsolete -o \$[@].new && mv \$[@].new \$[@]
+ msgmerge --previous -q \$[@] \$(srcdir)/po/wine.pot | msgattrib --no-obsolete -o \$[@].new && mv \$[@].new \$[@]
\$(srcdir)/po/wine.pot: \$(ALL_POT_FILES)
msgcat -o \$[@] \$(ALL_POT_FILES)])
fi
