LUCENE-9438: moved eclipse template files under corresponding gradle's script.

gradle/defaults.gradle

@@ -57,5 +57,11 @@ allprojects {
     propertyOrEnvOrDefault = { propName, envName, defValue ->
       return propertyOrDefault(propName, envOrDefault(envName, defValue));
     }
+
+    // Locate script-relative resource folder. This is context-sensitive so pass
+    // the right buildscript (top-level).
+    scriptResources = { buildscript ->
+      return file(buildscript.sourceFile.absolutePath.replaceAll('.gradle$', ""))
+    }
   }
 }

gradle/ide/eclipse.gradle

@@ -18,6 +18,8 @@
 import org.gradle.plugins.ide.eclipse.model.SourceFolder
 import org.gradle.plugins.ide.eclipse.model.ClasspathEntry
 
+def resources = scriptResources(buildscript)
+
 configure(rootProject) {
   apply plugin: "eclipse"
 
@@ -73,7 +75,7 @@ configure(rootProject) {
   eclipseJdt {
     doLast {
       project.sync {
-        from rootProject.file("dev-tools/eclipse/dot.settings")
+        from rootProject.file("${resources}/dot.settings")
         into rootProject.file(".settings")
       }
     }