Move X509_ALGOR to x509.h.

This matches OpenSSL and the name. Also accessors like X509_ALGOR_get0
are in x509.h.

Change-Id: Ic7583edcf04627cbfae822df11e75eebdd9ad7aa
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/48770
Reviewed-by: Adam Langley <agl@google.com>

include/openssl/asn1.h

@@ -954,13 +954,6 @@ typedef STACK_OF(ASN1_TYPE) ASN1_SEQUENCE_ANY;
 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ASN1_SEQUENCE_ANY, ASN1_SEQUENCE_ANY)
 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ASN1_SEQUENCE_ANY, ASN1_SET_ANY)
 
-struct X509_algor_st {
-  ASN1_OBJECT *algorithm;
-  ASN1_TYPE *parameter;
-} /* X509_ALGOR */;
-
-DECLARE_ASN1_FUNCTIONS(X509_ALGOR)
-
 // M_ASN1_* are legacy aliases for various |ASN1_STRING| functions. Use the
 // functions themselves.
 #define M_ASN1_STRING_length(x) ASN1_STRING_length(x)

include/openssl/x509.h

@@ -110,6 +110,13 @@ extern "C" {
 #define X509v3_KU_DECIPHER_ONLY 0x8000
 #define X509v3_KU_UNDEF 0xffff
 
+struct X509_algor_st {
+  ASN1_OBJECT *algorithm;
+  ASN1_TYPE *parameter;
+} /* X509_ALGOR */;
+
+DECLARE_ASN1_FUNCTIONS(X509_ALGOR)
+
 DEFINE_STACK_OF(X509_ALGOR)
 
 typedef STACK_OF(X509_ALGOR) X509_ALGORS;