Drop myProvided from the build

Introduces by Mark in d928047678.

Dropped because Project#copy no longer exists (publically) in sbt 1.

It looks like it might have been added to deal with transitive
dependencies of scala-compiler, possibly JLine. Now it looks like it's
only used by launcher-interface, which has 0 dependencies.

build.sbt

@@ -312,8 +312,6 @@ def scriptedUnpublishedTask: Def.Initialize[InputTask[Unit]] = Def.inputTask {
 
 lazy val publishLauncher = TaskKey[Unit]("publish-launcher")
 
-lazy val myProvided = config("provided") intransitive
-
 def allProjects =
   Seq(
     testingProj,
@@ -332,10 +330,7 @@ def allProjects =
     bundledLauncherProj
   )
 
-def projectsWithMyProvided =
-  allProjects.map(p =>
-    p.copy(configurations = (p.configurations.filter(_ != Provided)) :+ myProvided))
-lazy val nonRoots = projectsWithMyProvided.map(p => LocalProject(p.id))
+lazy val nonRoots = allProjects.map(p => LocalProject(p.id))
 
 def rootSettings =
   fullDocSettings ++