Fix unused pattern vals warnings in main-command project

main-command/src/main/scala/sbt/internal/ConsoleChannel.scala

@@ -46,7 +46,7 @@ private[sbt] final class ConsoleChannel(val name: String) extends CommandChannel
     event match {
       case e: ConsolePromptEvent =>
         askUserThread match {
-          case Some(x) => //
+          case Some(_) =>
           case _ =>
             val x = makeAskUserThread(e.state)
             askUserThread = Some(x)
@@ -56,7 +56,7 @@ private[sbt] final class ConsoleChannel(val name: String) extends CommandChannel
         e.lastSource match {
           case Some(src) if src.channelName != name =>
             askUserThread match {
-              case Some(x) =>
+              case Some(_) =>
               // keep listening while network-origin command is running
               // make sure to test Windows and Cygwin, if you uncomment
               // shutdown()

main-command/src/main/scala/sbt/internal/client/NetworkClient.scala

@@ -111,7 +111,7 @@ class NetworkClient(arguments: List[String]) { self =>
     try {
       connection.publish(bytes)
     } catch {
-      case e: SocketException =>
+      case _: SocketException =>
       // log.debug(e.getMessage)
       // toDel += client
     }

main-command/src/main/scala/xsbt/IPC.scala

@@ -31,7 +31,7 @@ object IPC {
     def createServer(attempts: Int): ServerSocket =
       if (attempts > 0)
         try { new ServerSocket(nextPort, 1, loopback) } catch {
-          case NonFatal(e) => createServer(attempts - 1)
+          case NonFatal(_) => createServer(attempts - 1)
         } else
         sys.error("Could not connect to socket: maximum attempts exceeded")
     createServer(10)