Exclude crtbrand.o from the NDK sysroot.

Bug: None
Test: None
Change-Id: I8cb860d9c47b9140926531d21f7864b8d7cbcba3
diff --git a/libc/Android.bp b/libc/Android.bp
index 93f9ce9..affe013 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -2183,6 +2183,8 @@
     srcs: ["arch-common/bionic/crtbrand.S"],
 
     defaults: ["crt_so_defaults"],
+    // crtbrand is an intermediate artifact, not a final CRT object.
+    exclude_from_ndk_sysroot: true,
 }
 
 cc_object {