move DSA_SIG definition into C source file

Reviewed-by: NRich Salz <rsalz@openssl.org>

crypto/dsa/dsa_asn1.c

@@ -62,7 +62,11 @@
 #include <openssl/asn1.h>
 #include <openssl/asn1t.h>
 #include <openssl/rand.h>
-#include "dsa_locl.h"
+
+struct DSA_SIG_st {
+    BIGNUM *r;
+    BIGNUM *s;
+};
 
 ASN1_SEQUENCE(DSA_SIG) = {
         ASN1_SIMPLE(DSA_SIG, r, CBIGNUM),

crypto/dsa/dsa_locl.h

@@ -65,8 +65,3 @@ int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
                           size_t seed_len, int idx, unsigned char *seed_out,
                           int *counter_ret, unsigned long *h_ret,
                           BN_GENCB *cb);
-
-struct DSA_SIG_st {
-    BIGNUM *r;
-    BIGNUM *s;
-};