Minor copybara fixes

- Remove proguard-rules.txt symlink
- Guard against classes annotated with @ClosedSource but not excluded

PiperOrigin-RevId: 311312671

library/extractor/build.gradle

@@ -40,10 +40,10 @@ android {
 
 
 dependencies {
 dependencies {
     implementation 'androidx.annotation:annotation:' + androidxAnnotationVersion
     implementation 'androidx.annotation:annotation:' + androidxAnnotationVersion
+    implementation project(modulePrefix + 'library-common')
     compileOnly 'org.checkerframework:checker-qual:' + checkerframeworkVersion
     compileOnly 'org.checkerframework:checker-qual:' + checkerframeworkVersion
     compileOnly 'org.checkerframework:checker-compat-qual:' + checkerframeworkVersion
     compileOnly 'org.checkerframework:checker-compat-qual:' + checkerframeworkVersion
     compileOnly 'org.jetbrains.kotlin:kotlin-annotations-jvm:' + kotlinAnnotationsVersion
     compileOnly 'org.jetbrains.kotlin:kotlin-annotations-jvm:' + kotlinAnnotationsVersion
-    implementation project(modulePrefix + 'library-common')
     testImplementation project(modulePrefix + 'library-core')
     testImplementation project(modulePrefix + 'library-core')
     testImplementation project(modulePrefix + 'testutils')
     testImplementation project(modulePrefix + 'testutils')
     testImplementation project(modulePrefix + 'testdata')
     testImplementation project(modulePrefix + 'testdata')