external/conscrypt: a couple more BoringSSL build fixes.

I had these in my local client and didn't notice until now.

Change-Id: I9c61447691d358acbaadb9b9a2f068b4106d266c
diff --git a/Android.mk b/Android.mk
index cffa6fe..914a2a9 100644
--- a/Android.mk
+++ b/Android.mk
@@ -168,6 +168,7 @@
 LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE := libconscrypt_static
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
+LOCAL_STATIC_LIBRARIES := libssl_static libcrypto_static
 LOCAL_SDK_VERSION := 9
 include $(BUILD_STATIC_LIBRARY)