Fix build breakage

sshd is using the symbol arc4random_stir which is not exposed from the
libc in the runtime APEX. Override this by directly linking to the
bootstrap bionic which exposes the symbol

Test: m sshd
Change-Id: I37ae12f1d979725e6396ccab20c6ea57d84724a6
diff --git a/Android.mk b/Android.mk
index 355f64c..8600be1 100644
--- a/Android.mk
+++ b/Android.mk
@@ -294,6 +294,7 @@
     external/openssh/openbsd-compat
 
 LOCAL_SHARED_LIBRARIES += libssh libssl libcrypto libdl libz libcutils
+LOCAL_SHARED_LIBRARIES += libc.bootstrap
 
 include $(BUILD_EXECUTABLE)