Revert "BoringSSL: Define RSA_bits() helper"

This reverts commit 3cfbd3b0f63fb299f1187f16db6fcec9421e3df4 since
BoringSSL added RSA_bits() in commit
8dc226ca8f1ef60737e1c1bf8cfcabf51d4068c7 ('Add some missing OpenSSL
1.1.0 accessors.').

Signed-off-by: Jouni Malinen <j@w1.fi>

src/crypto/tls_openssl.c

@@ -103,7 +103,7 @@ static size_t SSL_SESSION_get_master_key(const SSL_SESSION *session,
 
 #endif
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(OPENSSL_IS_BORINGSSL)
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
 #ifdef CONFIG_SUITEB
 static int RSA_bits(const RSA *r)
 {