Add some missing OpenSSL 1.1.0 accessors.

wpa_supplicant appear to be using these.

Change-Id: I1f220cae69162901bcd9452e8daf67379c5e276c
Reviewed-on: https://boringssl-review.googlesource.com/23324
Reviewed-by: Steven Valdez <svaldez@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/include/openssl/rsa.h b/include/openssl/rsa.h
index 74268cf..11aa8e4 100644
--- a/include/openssl/rsa.h
+++ b/include/openssl/rsa.h
@@ -89,6 +89,9 @@
 
 // Properties.
 
+// RSA_bits returns the size of |rsa|, in bits.
+OPENSSL_EXPORT unsigned RSA_bits(const RSA *rsa);
+
 // RSA_get0_key sets |*out_n|, |*out_e|, and |*out_d|, if non-NULL, to |rsa|'s
 // modulus, public exponent, and private exponent, respectively. If |rsa| is a
 // public key, the private exponent will be set to NULL.