Remove remaining remnants of RIPEMD-160 support.

Change-Id: I59d06bcb9245ba93d3c3b63afbc24d6cef7c5af4
Reviewed-on: https://boringssl-review.googlesource.com/3925
Reviewed-by: Adam Langley <agl@google.com>

include/openssl/opensslfeatures.h

diff --git a/include/openssl/opensslfeatures.h b/include/openssl/opensslfeatures.h
index c79b1c5..c3f97d5 100644
--- a/include/openssl/opensslfeatures.h
+++ b/include/openssl/opensslfeatures.h
@@ -47,6 +47,7 @@
 #define OPENSSL_NO_RC5
 #define OPENSSL_NO_RFC3779
 #define OPENSSL_NO_RIPEMD
+#define OPENSSL_NO_RMD160
 #define OPENSSL_NO_SCTP
 #define OPENSSL_NO_SEED
 #define OPENSSL_NO_SRP