FIX #982 Add maven-plugin to classpathTypes when using the JDebPlugin

Author: muuki88

src/main/scala/com/typesafe/sbt/packager/debian/JDebPackaging.scala

@@ -5,7 +5,7 @@ package debian
 import com.typesafe.sbt.packager.archetypes.TemplateWriter
 import com.typesafe.sbt.packager.universal.Archives
 import sbt._
-import sbt.Keys.{mappings, normalizedName, packageBin, streams, target, version}
+import sbt.Keys.{classpathTypes, normalizedName, packageBin, streams, target, version}
 import linux.{LinuxFileMetaData, LinuxPackageMapping, LinuxSymlink}
 import linux.LinuxPlugin.autoImport.{
   linuxPackageMappings,
@@ -98,7 +98,8 @@ object JDebPackaging extends AutoPlugin with DebianPluginLike {
       debMaker validate ()
       debMaker makeDeb ()
       debianFile
-    }
+    },
+    classpathTypes += "maven-plugin"
   )
 
   /**