Remove Eclipse resource filter for 'build' folder

Commit 3eec27a723 introduced a custom resource filter for projects
imported into Eclipse IDE. However, commit 85eb589c2e introduced
generated source files within the Gradle 'build' folder, and the filter
prevents Eclipse from seeing the generated sources, resulting in build
errors within the spring-oxm project in Eclipse.

This commit therefore effectively reverts 3eec27a723 by removing the
resource filter.

See gh-25787

gradle/ide.gradle

@@ -108,21 +108,3 @@ task eclipseBuildship(type: Copy) {
 tasks["eclipseJdt"].dependsOn(eclipseJdtPrepare)
 tasks["cleanEclipse"].dependsOn(cleanEclipseJdtUi)
 tasks["eclipse"].dependsOn(eclipseSettings, eclipseWstComponent)
-
-
-// Filter 'build' folder
-eclipse.project.file.withXml {
-	def node = it.asNode()
-
-	def filteredResources = node.get("filteredResources")
-	if(filteredResources) {
-		node.remove(filteredResources)
-	}
-	def filterNode = node.appendNode("filteredResources").appendNode("filter")
-	filterNode.appendNode("id", "1359048889071")
-	filterNode.appendNode("name", "")
-	filterNode.appendNode("type", "30")
-	def matcherNode = filterNode.appendNode("matcher")
-	matcherNode.appendNode("id", "org.eclipse.ui.ide.multiFilter")
-	matcherNode.appendNode("arguments", "1.0-projectRelativePath-matches-false-false-build")
-}