Reinstate obj_xref.h as it is not auto generated on all platforms.

crypto/objects/obj_xref.h

diff --git a/crypto/objects/obj_xref.h b/crypto/objects/obj_xref.h
new file mode 100644
index 0000000..d5b9b8e
--- /dev/null
+++ b/crypto/objects/obj_xref.h
@@ -0,0 +1,75 @@
+/* AUTOGENERATED BY objxref.pl, DO NOT EDIT */
+
+typedef struct
+	{
+	int sign_id;
+	int hash_id;
+	int pkey_id;
+	} nid_triple;
+
+static const nid_triple sigoid_srt[] =
+	{
+	{NID_md2WithRSAEncryption, NID_md2, NID_rsaEncryption},
+	{NID_md5WithRSAEncryption, NID_md5, NID_rsaEncryption},
+	{NID_shaWithRSAEncryption, NID_sha, NID_rsaEncryption},
+	{NID_sha1WithRSAEncryption, NID_sha1, NID_rsaEncryption},
+	{NID_dsaWithSHA, NID_sha, NID_dsa},
+	{NID_dsaWithSHA1_2, NID_sha1, NID_dsa_2},
+	{NID_mdc2WithRSA, NID_mdc2, NID_rsaEncryption},
+	{NID_md5WithRSA, NID_md5, NID_rsa},
+	{NID_dsaWithSHA1, NID_sha1, NID_dsa},
+	{NID_sha1WithRSA, NID_sha1, NID_rsa},
+	{NID_ripemd160WithRSA, NID_ripemd160, NID_rsaEncryption},
+	{NID_md4WithRSAEncryption, NID_md4, NID_rsaEncryption},
+	{NID_ecdsa_with_SHA1, NID_sha1, NID_X9_62_id_ecPublicKey},
+	{NID_sha256WithRSAEncryption, NID_sha256, NID_rsaEncryption},
+	{NID_sha384WithRSAEncryption, NID_sha384, NID_rsaEncryption},
+	{NID_sha512WithRSAEncryption, NID_sha512, NID_rsaEncryption},
+	{NID_sha224WithRSAEncryption, NID_sha224, NID_rsaEncryption},
+	{NID_ecdsa_with_Recommended, NID_undef, NID_X9_62_id_ecPublicKey},
+	{NID_ecdsa_with_Specified, NID_undef, NID_X9_62_id_ecPublicKey},
+	{NID_ecdsa_with_SHA224, NID_sha224, NID_X9_62_id_ecPublicKey},
+	{NID_ecdsa_with_SHA256, NID_sha256, NID_X9_62_id_ecPublicKey},
+	{NID_ecdsa_with_SHA384, NID_sha384, NID_X9_62_id_ecPublicKey},
+	{NID_ecdsa_with_SHA512, NID_sha512, NID_X9_62_id_ecPublicKey},
+	{NID_dsa_with_SHA224, NID_sha224, NID_dsa},
+	{NID_dsa_with_SHA256, NID_sha256, NID_dsa},
+	{NID_id_GostR3411_94_with_GostR3410_2001, NID_id_GostR3411_94, NID_id_GostR3410_2001},
+	{NID_id_GostR3411_94_with_GostR3410_94, NID_id_GostR3411_94, NID_id_GostR3410_94},
+	{NID_id_GostR3411_94_with_GostR3410_94_cc, NID_id_GostR3411_94, NID_id_GostR3410_94_cc},
+	{NID_id_GostR3411_94_with_GostR3410_2001_cc, NID_id_GostR3411_94, NID_id_GostR3410_2001_cc},
+	};
+
+static const nid_triple * const sigoid_srt_xref[] =
+	{
+	&sigoid_srt[17],
+	&sigoid_srt[18],
+	&sigoid_srt[0],
+	&sigoid_srt[1],
+	&sigoid_srt[7],
+	&sigoid_srt[2],
+	&sigoid_srt[4],
+	&sigoid_srt[3],
+	&sigoid_srt[9],
+	&sigoid_srt[5],
+	&sigoid_srt[8],
+	&sigoid_srt[12],
+	&sigoid_srt[6],
+	&sigoid_srt[10],
+	&sigoid_srt[11],
+	&sigoid_srt[13],
+	&sigoid_srt[24],
+	&sigoid_srt[20],
+	&sigoid_srt[14],
+	&sigoid_srt[21],
+	&sigoid_srt[15],
+	&sigoid_srt[22],
+	&sigoid_srt[16],
+	&sigoid_srt[23],
+	&sigoid_srt[19],
+	&sigoid_srt[25],
+	&sigoid_srt[26],
+	&sigoid_srt[27],
+	&sigoid_srt[28],
+	};
+