Do not depend on Shadow plugin in subprojects

Since buildSrc depends on the Shadow plugin, it's already in the
classpath of all build scripts

prepare/compiler-client-embeddable/build.gradle.kts

@@ -2,16 +2,6 @@ import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 
 description = "Kotlin compiler client embeddable"
 
-buildscript {
-    repositories {
-        jcenter()
-    }
-
-    dependencies {
-        classpath("com.github.jengelman.gradle.plugins:shadow:${property("versions.shadow")}")
-    }
-}
-
 plugins {
     maven
 }

prepare/compiler/build.gradle.kts

@@ -1,4 +1,3 @@
-
 import java.io.File
 import proguard.gradle.ProGuardTask
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
@@ -7,12 +6,7 @@ import org.gradle.api.file.DuplicatesStrategy
 description = "Kotlin Compiler"
 
 buildscript {
-    repositories {
-        jcenter()
-    }
-
     dependencies {
-        classpath("com.github.jengelman.gradle.plugins:shadow:${property("versions.shadow")}")
         classpath("net.sf.proguard:proguard-gradle:${property("versions.proguard")}")
     }
 }

prepare/idea-plugin/build.gradle.kts

@@ -1,19 +1,8 @@
-
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 import org.gradle.jvm.tasks.Jar
 
 description = "Kotlin IDEA plugin"
 
-buildscript {
-    repositories {
-        jcenter()
-    }
-
-    dependencies {
-        classpath("com.github.jengelman.gradle.plugins:shadow:${property("versions.shadow")}")
-    }
-}
-
 plugins {
     `java-base`
 }

prepare/jps-plugin/build.gradle.kts

@@ -1,18 +1,7 @@
-
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 
 description = "Kotlin JPS plugin"
 
-buildscript {
-    repositories {
-        jcenter()
-    }
-
-    dependencies {
-        classpath("com.github.jengelman.gradle.plugins:shadow:${property("versions.shadow")}")
-    }
-}
-
 plugins {
     `java-base`
 }