Definitively remove the --jsoutput option of scalajsld.
Definitively remove the --jsoutput option of scalajsld.

As the `jsDependencies` mechanism will be extracted, there is no
coming back for scalajsld to support that option.

sjrd/scala-js,sjrd/scala-js,nicolasstucki/scala-js,scala-js/scala-js,gzm0/scala-js,nicolasstucki/scala-js,sjrd/scala-js,scala-js/scala-js,SebsLittleHelpers/scala-js,scala-js/scala-js,gzm0/scala-js,SebsLittleHelpers/scala-js