sbt-dotty: Don't break scaladoc in non-Dotty projects

Author: smarter

sbt-dotty/src/dotty/tools/sbtplugin/DottyPlugin.scala

@@ -153,7 +153,12 @@ object DottyPlugin extends AutoPlugin {
           scalaOrganization.value
       },
 
-      scalacOptions in (Compile, doc) ++= Seq("-project", name.value),
+      scalacOptions in (Compile, doc) ++= {
+        if (isDotty.value)
+          Seq("-project", name.value)
+        else
+          Seq()
+      },
 
       incOptions in Compile := {
         val inc = (incOptions in Compile).value