`#apex` symbols no longer contribute to platform libraries

Bug: 239274367
Test: m
Change-Id: I7a6cd0f46071d5dbbf9510df5693a0d6b95e10c0
diff --git a/cc/library.go b/cc/library.go
index e2d5ef6..443d6d0 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -1039,9 +1039,7 @@
 		if ctx.Module().(android.ApexModule).NotInPlatform() {
 			flag = "--apex"
 		} else {
-			// TODO(b/239274367) drop --apex when #apex is replaced with #systemapi
-			// in the map.txt files of platform libraries
-			flag = "--systemapi --apex"
+			flag = "--systemapi"
 		}
 		nativeAbiResult := parseNativeAbiDefinition(ctx, symbolFile,
 			android.ApiLevelOrPanic(ctx, library.MutatedProperties.StubsVersion), flag)