Simplify JDK copy specification in archives build

This commit simplifies the JDK copy specification in the archives build
so that it's a single line as opposed to an if/else with a repeated
body. This approach reduces the maintenance cost of this code.

distribution/archives/build.gradle

@@ -61,14 +61,8 @@ CopySpec archiveFiles(CopySpec modulesFiles, String distributionType, String pla
         with binFiles(distributionType, oss, jdk)
       }
       if (jdk) {
-        if ("darwin".equals(platform)) {
+        into("darwin".equals(platform) ? 'jdk.app' : 'jdk')
-          into('jdk.app') {
+          with jdkFiles(project, platform)
-            with jdkFiles(project, platform)
-          }
-        } else {
-          into('jdk') {
-            with jdkFiles(project, platform)
-          }
         }
       }
       into('') {