Use official Gradle-Plugin artifacts on Maven Central for linking aga…

…inst Gradle

ivy-settings.xml

@@ -23,11 +23,9 @@
   <include url="${ivy.default.settings.dir}/ivysettings-main-chain.xml"/>
 
   <resolvers>
-    <ibiblio name="gradle" root="https://repo.gradle.org/gradle/libs-releases-local" m2compatible="true" />
     <ibiblio name="maven-http-backup" root="${ivy.maven-central.backup}" m2compatible="true" />
     <chain name="default" returnFirst="true" checkmodified="true" changingPattern=".*SNAPSHOT">
       <resolver ref="maven-http-backup" /><!-- use HTTP with Java 7 -->
-      <resolver ref="gradle" />
     </chain>
   </resolvers>
 </ivysettings>

ivy.xml

@@ -35,10 +35,7 @@
     <dependency org="org.apache.maven" name="maven-plugin-api" rev="&maven.version;" conf="build"/>
     <dependency org="org.apache.maven" name="maven-artifact" rev="&maven.version;" conf="build"/>
     <dependency org="org.apache.maven.plugin-tools" name="maven-plugin-annotations" rev="3.4" conf="build"/>
-    <dependency org="org.gradle" name="gradle-core" rev="&gradle.version;" conf="build"/>
-    <dependency org="org.gradle" name="gradle-base-services" rev="&gradle.version;" conf="build"/>
-    <dependency org="org.gradle" name="gradle-base-services-groovy" rev="&gradle.version;" conf="build"/>
-    <dependency org="org.gradle" name="gradle-logging" rev="&gradle.version;" conf="build"/>
+    <dependency org="dev.gradleplugins" name="gradle-api" rev="&gradle.version;" conf="build"/>
     <dependency org="org.slf4j" name="slf4j-api" rev="1.7.7" conf="build"/>
     <!-- Gradle also needs Groovy, but we need it as build tool, too: -->
     <dependency org="org.codehaus.groovy" name="groovy-all" rev="2.4.17" conf="build,buildtools"/>