Minor, remove obsolete jvmTarget modifications in compiler modules

Default JVM target (as well as JDK home) is set to 1.8 for all Gradle
projects in build.gradle.kts:352.

compiler/cli/build.gradle.kts

@@ -3,8 +3,6 @@ plugins {
     id("jps-compatible")
 }
 
-jvmTarget = "1.8"
-
 dependencies {
     compile(project(":compiler:util"))
     compile(project(":compiler:cli-common"))

compiler/daemon/build.gradle.kts

@@ -1,8 +1,3 @@
-/*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
- * that can be found in the license/LICENSE.txt file.
- */
-
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 
 description = "Kotlin Daemon New"
@@ -12,8 +7,6 @@ plugins {
     id("jps-compatible")
 }
 
-jvmTarget = "1.8"
-
 val ktorExcludesForDaemon : List<Pair<String, String>> by rootProject.extra
 
 dependencies {

compiler/daemon/daemon-client-new/build.gradle.kts

@@ -1,8 +1,3 @@
-/*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
- * that can be found in the license/LICENSE.txt file.
- */
-
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 
 description = "Kotlin Daemon Client New"
@@ -12,8 +7,6 @@ plugins {
     id("jps-compatible")
 }
 
-jvmTarget = "1.8"
-
 val nativePlatformVariants = listOf(
     "windows-amd64",
     "windows-i386",

compiler/tests-java8/build.gradle.kts

@@ -23,11 +23,6 @@ sourceSets {
     "test" { projectDefault() }
 }
 
-tasks.withType<KotlinCompile> {
-    kotlinOptions.jdkHome = rootProject.extra["JDK_18"]!!.toString()
-    kotlinOptions.jvmTarget = "1.8"
-}
-
 projectTest(parallel = true) {
     executable = "${rootProject.extra["JDK_18"]!!}/bin/java"
     dependsOn(":dist")