Renamed dummy extraction file rc_okular_poppler.cpp to usual rc.cpp.

When special dummy file name is used, it needs to be listed in
the l10n-kde4/scripts/repack-pot.pl script. So when the special
name is not necessary, better use the usual one.

generators/poppler/Messages.sh

@@ -1,4 +1,4 @@
 #!/bin/sh
-$EXTRACTRC $(find conf/ -name "*.ui" -o -name "*.kcfg") >> rc_okular_poppler.cpp || exit 11
+$EXTRACTRC $(find conf/ -name "*.ui" -o -name "*.kcfg") >> rc.cpp || exit 11
 $XGETTEXT $(find . -name "*.cpp" -o -name "*.h") -o $podir/okular_poppler.pot
-rm -f rc_okular_poppler.cpp
+rm -f rc.cpp