Build sdk variants of libc++ for riscv64 am: 69c72cf1ae am: b44510800b am: bb40acda2b

Original change: https://android-review.googlesource.com/c/platform/external/libcxx/+/2404996

Change-Id: I3101bbbfd5310cb2d2058663ad0bfcb06d678366
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/Android.bp b/Android.bp
index 5191017..3868e27 100644
--- a/Android.bp
+++ b/Android.bp
@@ -191,10 +191,6 @@
             enabled: true,
         },
     },
-
-    header_abi_checker: {
-        diff_flags: ["-allow-adding-removing-weak-symbols"],
-    },
 }
 
 cc_library_static {