remove duplicate entry for oid_shaWithRSASignatureOiw, which
resulted in the parallel array digestalg to be off.  the parallel array
should be eliminated.

Reference: /n/atom/patch/applied/x509oiwfix
Date: Sun Mar 16 17:06:05 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/libsec/port/x509.c	Sun Mar 16 17:05:16 2014
+++ /sys/src/libsec/port/x509.c	Sun Mar 16 17:05:18 2014
@@ -1608,11 +1608,10 @@
 	(Ints*)&oid_sha1WithRSAEncryption,
 	(Ints*)&oid_sha1WithRSAEncryptionOiw,
 	(Ints*)&oid_sha256WithRSAEncryption,
-	(Ints*)&oid_shaWithRSASignatureOiw,
 	(Ints*)&oid_md5,
 	nil
 };
-static DigestFun digestalg[NUMALGS+1] = { md5, md5, md5, md5, sha1, sha1, md5, nil };
+static DigestFun digestalg[NUMALGS+1] = { md5, md5, md5, md5, sha1, sha1, sha2_256, md5, nil };
 
 static void
 freecert(CertX509* c)