Work around lack of functional NPN_PluginThreadAsyncCall in Opera on Linux
Work around lack of functional NPN_PluginThreadAsyncCall in Opera on Linux

Signed-off-by: Jean-Baptiste Kempf <7b85a41a628204b76aba4326273a3ccc74bd009a@videolan.org>

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