mowilla: Fix webplugin distribution on Mac OS X.
mowilla: Fix webplugin distribution on Mac OS X.

Please test, as I don't build mozilla.

rdp/npapi-vlc,modulexcite/npapi-vlc,modulexcite/npapi-vlc,chengsun/gtk-npapi-vlc,rdp/npapi-vlc,chengsun/gtk-npapi-vlc,rdp/npapi-vlc,rdp/npapi-vlc,modulexcite/npapi-vlc,modulexcite/npapi-vlc,jamesbates/npapi-vlc,chengsun/gtk-npapi-vlc,jamesbates/npapi-vlc,jamesbates/npapi-vlc