See https://wiki.documentfoundation.org/Development/Emscripten for details

Change-Id: I977a8b9e98b9be13c263fef48f567b92347d0492
Reviewed-on: https://gerrit.libreoffice.org/18643Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
Tested-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>