Port bitcoin-core/secp256k1#1628 to zkp public API

include/secp256k1_ecdsa_s2c.h

@@ -25,7 +25,7 @@ extern "C" {
  *  If you need to convert to a format suitable for storage, transmission, or
  *  comparison, use secp256k1_ecdsa_s2c_opening_serialize and secp256k1_ecdsa_s2c_opening_parse.
  */
-typedef struct {
+typedef struct secp256k1_ecdsa_s2c_opening {
     unsigned char data[64];
 } secp256k1_ecdsa_s2c_opening;
 

include/secp256k1_generator.h

@@ -17,7 +17,7 @@ extern "C" {
  *  If you need to convert to a format suitable for storage, transmission, or
  *  comparison, use secp256k1_generator_serialize and secp256k1_generator_parse.
  */
-typedef struct {
+typedef struct secp256k1_generator {
     unsigned char data[64];
 } secp256k1_generator;
 
@@ -100,7 +100,7 @@ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_generator_generate_blin
  *  comparison, use secp256k1_pedersen_commitment_serialize and
  *  secp256k1_pedersen_commitment_parse.
  */
-typedef struct {
+typedef struct secp256k1_pedersen_commitment {
     unsigned char data[64];
 } secp256k1_pedersen_commitment;
 

include/secp256k1_surjectionproof.h

@@ -39,7 +39,7 @@ extern "C" {
  *  The representation is exposed to allow creation of these objects on the
  *  stack; please *do not* use these internals directly.
  */
-typedef struct {
+typedef struct secp256k1_surjectionproof {
 #ifdef VERIFY
     /** Mark whether this proof has gone through `secp256k1_surjectionproof_initialize` */
     int initialized;
@@ -100,7 +100,7 @@ SECP256K1_API int secp256k1_surjectionproof_serialize(
  * data the API user wants to use as an asset tag. Its contents have no
  * semantic meaning to libsecp whatsoever.
  */
-typedef struct {
+typedef struct secp256k1_fixed_asset_tag {
     unsigned char data[32];
 } secp256k1_fixed_asset_tag;
 

include/secp256k1_whitelist.h

@@ -31,7 +31,7 @@ extern "C" {
  *  stack; please *do not* use these internals directly. To learn the number
  *  of keys for a signature, use `secp256k1_whitelist_signature_n_keys`.
  */
-typedef struct {
+typedef struct secp256k1_whitelist_signature {
     size_t n_keys;
     /* e0, scalars */
     unsigned char data[32 * (1 + SECP256K1_WHITELIST_MAX_N_KEYS)];