RSA_NULL used to be a compile option allowing the RSA interfaces to be

compiled-in, with nonfunctional code, to be able to cope with the RSA
patent.
However, we don't use this option, and the RSA patent has expired more than 10
years ago, so just drop this piece.

src/lib/libcrypto/crypto/Makefile

@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.42 2014/07/08 16:07:37 miod Exp $
+# $OpenBSD: Makefile,v 1.43 2014/07/09 08:44:53 miod Exp $
 
 LIB=	crypto
 
@@ -219,7 +219,7 @@ SRCS+= rmd_dgst.c rmd_one.c
 
 # rsa/
 SRCS+= rsa_eay.c rsa_gen.c rsa_lib.c rsa_sign.c rsa_saos.c rsa_err.c
-SRCS+= rsa_pk1.c rsa_ssl.c rsa_none.c rsa_oaep.c rsa_chk.c rsa_null.c
+SRCS+= rsa_pk1.c rsa_ssl.c rsa_none.c rsa_oaep.c rsa_chk.c
 SRCS+= rsa_pss.c rsa_x931.c rsa_asn1.c rsa_depr.c rsa_ameth.c rsa_prn.c
 SRCS+= rsa_pmeth.c rsa_crpt.c