Fix scala usage in :tools:admin and :core:standalone. (#4861)

Author: markusthoemmes

core/standalone/build.gradle

@@ -152,6 +152,7 @@ bootJar {
 install.dependsOn(bootJar)
 
 dependencies {
+    compile "org.scala-lang:scala-library:${gradle.scala.version}"
     compile project(':core:controller')
     compile project(':tools:admin')
     compile "org.rogach:scallop_${gradle.scala.depVersion}:3.3.2"
@@ -164,10 +165,6 @@ dependencies {
     testCompile "org.scalatest:scalatest_${gradle.scala.depVersion}:3.0.8"
 }
 
-tasks.withType(ScalaCompile) {
-    scalaCompileOptions.additionalParameters = gradle.scala.compileFlags
-}
-
 gradle.projectsEvaluated {
     tasks.withType(Test) {
         testLogging {

tools/admin/build.gradle

@@ -42,10 +42,7 @@ bootJar {
 }
 
 dependencies {
+    compile "org.scala-lang:scala-library:${gradle.scala.version}"
     compile project(':common:scala')
     compile "org.rogach:scallop_${gradle.scala.depVersion}:3.3.2"
 }
-
-tasks.withType(ScalaCompile) {
-    scalaCompileOptions.additionalParameters = gradle.scala.compileFlags
-}