NDK library: enable feature flags for diffing ABI representations

Bug: 156513478
Change-Id: I94a0e2de051da9d9d82414a7189399553981c53f
Signed-off-by: Matthias Maennich <maennich@google.com>
diff --git a/cc/ndk_library.go b/cc/ndk_library.go
index 9df628f..40bf218 100644
--- a/cc/ndk_library.go
+++ b/cc/ndk_library.go
@@ -339,7 +339,7 @@
 
 // Feature flag to disable diffing against prebuilts.
 func canDiffAbi() bool {
-	return false
+	return true
 }
 
 func (this *stubDecorator) dumpAbi(ctx ModuleContext, symbolList android.Path) {