Remove stale SM2 error codes

Run `make update ERROR_REBUILD=-rebuild` to remove some stale error
codes for SM2 (which is now using its own submodule for error codes,
i.e., `SM2_*`).
Reviewed-by: NAndy Polyakov <appro@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6690)

crypto/ec/ec_err.c

@@ -261,12 +261,6 @@ static const ERR_STRING_DATA EC_str_functs[] = {
     {ERR_PACK(ERR_LIB_EC, EC_F_PKEY_EC_KEYGEN, 0), "pkey_ec_keygen"},
     {ERR_PACK(ERR_LIB_EC, EC_F_PKEY_EC_PARAMGEN, 0), "pkey_ec_paramgen"},
     {ERR_PACK(ERR_LIB_EC, EC_F_PKEY_EC_SIGN, 0), "pkey_ec_sign"},
-    {ERR_PACK(ERR_LIB_EC, EC_F_PKEY_SM2_CTRL, 0), "pkey_sm2_ctrl"},
-    {ERR_PACK(ERR_LIB_EC, EC_F_PKEY_SM2_CTRL_STR, 0), "pkey_sm2_ctrl_str"},
-    {ERR_PACK(ERR_LIB_EC, EC_F_PKEY_SM2_INIT, 0), "pkey_sm2_init"},
-    {ERR_PACK(ERR_LIB_EC, EC_F_PKEY_SM2_KEYGEN, 0), "pkey_sm2_keygen"},
-    {ERR_PACK(ERR_LIB_EC, EC_F_PKEY_SM2_PARAMGEN, 0), "pkey_sm2_paramgen"},
-    {ERR_PACK(ERR_LIB_EC, EC_F_PKEY_SM2_SIGN, 0), "pkey_sm2_sign"},
     {ERR_PACK(ERR_LIB_EC, EC_F_VALIDATE_ECX_DERIVE, 0), "validate_ecx_derive"},
     {0, NULL}
 };

crypto/include/internal/sm2err.h

@@ -15,6 +15,9 @@
 
 # ifndef OPENSSL_NO_SM2
 
+#  ifdef  __cplusplus
+extern "C"
+#  endif
 int ERR_load_SM2_strings(void);
 
 /*

include/internal/dsoerr.h

@@ -15,6 +15,9 @@
 
 # ifndef OPENSSL_NO_DSO
 
+#  ifdef  __cplusplus
+extern "C"
+#  endif
 int ERR_load_DSO_strings(void);
 
 /*

include/openssl/ecerr.h

@@ -183,12 +183,6 @@ int ERR_load_EC_strings(void);
 #  define EC_F_PKEY_EC_KEYGEN                              199
 #  define EC_F_PKEY_EC_PARAMGEN                            219
 #  define EC_F_PKEY_EC_SIGN                                218
-#  define EC_F_PKEY_SM2_CTRL                               284
-#  define EC_F_PKEY_SM2_CTRL_STR                           285
-#  define EC_F_PKEY_SM2_INIT                               287
-#  define EC_F_PKEY_SM2_KEYGEN                             288
-#  define EC_F_PKEY_SM2_PARAMGEN                           289
-#  define EC_F_PKEY_SM2_SIGN                               290
 #  define EC_F_VALIDATE_ECX_DERIVE                         278
 
 /*