Build: Remove buildSrc as a project in IDEs

We have have a virtual build-tools project which pulls in all the same
IDE settings we have for other projects, so there is no longer a need
for hacking buildSrc into our IDEs.

build.gradle

@@ -269,13 +269,6 @@ tasks.idea.doLast {
 if (System.getProperty('idea.active') != null && ideaMarker.exists() == false) {
   throw new GradleException('You must run gradle idea from the root of elasticsearch before importing into IntelliJ')
 }
-// add buildSrc itself as a groovy project
-task buildSrcIdea(type: GradleBuild) {
-  buildFile = 'buildSrc/build.gradle'
-  tasks = ['cleanIdea', 'ideaModule']
-}
-tasks.idea.dependsOn(buildSrcIdea)
-
 
 // eclipse configuration
 allprojects {
@@ -318,13 +311,6 @@ allprojects {
   tasks.eclipse.dependsOn(cleanEclipse, copyEclipseSettings)
 }
 
-// add buildSrc itself as a groovy project
-task buildSrcEclipse(type: GradleBuild) {
-  buildFile = 'buildSrc/build.gradle'
-  tasks = ['cleanEclipse', 'eclipse']
-}
-tasks.eclipse.dependsOn(buildSrcEclipse)
-
 // we need to add the same --debug-jvm option as
 // the real RunTask has, so we can pass it through
 class Run extends DefaultTask {