[Gradle] Remove workaround for gradle/gradle#15538 as the issue was f…

…ixed in Gradle 7.x.

build.gradle

@@ -101,9 +101,6 @@ subprojects {
 
     tasks.withType(JavaCompile) {
         if (buildJavaVersion >= 9) {
-            // -- Workaround for https://github.com/gradle/gradle/issues/15538
-            options.forkOptions.jvmArgs.addAll( ['--add-opens', 'jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED'] )
-            // --
             javaCompiler.set(toolchainCompiler)
         }
         else {
@@ -238,4 +235,4 @@ tasks.named("dependencyUpdates").configure {
 wrapper {
     gradleVersion = '7.1.1'
     distributionType = 'ALL'
-}
+}