OpenResty 1.13.6.2 and 1.19.3.1 support

# New or Updated APIs
- wolfSSL_get_tlsext_status_type
- wolfSSL_X509_chain_up_ref
- wolfSSL_get0_verified_chain
- SSL_CTX_set_cert_cb
- SSL_certs_clear
- SSL_add0_chain_cert ssl_cert_add0_chain_cert
- SSL_add1_chain_cert ssl_cert_add1_chain_cert
- sk_X509_NAME_new_null
- SSL_CTX_set_cert_cb
- SSL_set0_verify_cert_store
- SSL_set_client_CA_list

# Other Changes
- Ignore gdbinit
- Add api.c tests for new API
- Add `WOLFSSL_X509_STORE* x509_store_pt` to `WOLFSSL`
- Add macro to select the `WOLFSSL` specific store when available and the associated `WOLFSSL_CTX` store otherwise. Calls to `ssl->ctx->cm` and `ssl->ctx->x509_store*` were replaced by macros.
- NO-OP when setting existing store
- Add reference counter to `WOLFSSL_X509_STORE`
- Cleanup MD5 redundant declarations
- WOLFSSL_ERROR may map to nothing so make assignment outside of it
- refMutex fields are excluded with SINGLE_THREADED macro
- Chain cert refactor
- Make `wolfSSL_add0_chain_cert` and `wolfSSL_add1_chain_cert` not affect the context associated with the SSL object
- `wolfSSL_CTX_add1_chain_cert` now updates the `ctx->certChain` on success and stores the cert in `ctx->x509Chain` for later free'ing

wolfcrypt/src/evp.c

@@ -7354,11 +7354,15 @@ int wolfSSL_EVP_PKEY_get_default_digest_nid(WOLFSSL_EVP_PKEY *pkey, int *pnid)
 int wolfSSL_EVP_PKEY_up_ref(WOLFSSL_EVP_PKEY* pkey)
 {
     if (pkey) {
+#ifndef SINGLE_THREADED
         if (wc_LockMutex(&pkey->refMutex) != 0) {
             WOLFSSL_MSG("Failed to lock pkey mutex");
         }
+#endif
         pkey->references++;
+#ifndef SINGLE_THREADED
         wc_UnLockMutex(&pkey->refMutex);
+#endif
 
         return WOLFSSL_SUCCESS;
     }
@@ -7453,6 +7457,7 @@ WOLFSSL_EVP_PKEY* wolfSSL_EVP_PKEY_new_ex(void* heap)
         pkey->heap = heap;
         pkey->type = WOLFSSL_EVP_PKEY_DEFAULT;
 
+#ifndef SINGLE_THREADED
         /* init of mutex needs to come before wolfSSL_EVP_PKEY_free */
         ret = wc_InitMutex(&pkey->refMutex);
         if (ret != 0){
@@ -7460,6 +7465,7 @@ WOLFSSL_EVP_PKEY* wolfSSL_EVP_PKEY_new_ex(void* heap)
             WOLFSSL_MSG("Issue initializing mutex");
             return NULL;
         }
+#endif
 
 #ifndef HAVE_FIPS
         ret = wc_InitRng_ex(&pkey->rng, heap, INVALID_DEVID);
@@ -7485,16 +7491,20 @@ void wolfSSL_EVP_PKEY_free(WOLFSSL_EVP_PKEY* key)
     int doFree = 0;
     WOLFSSL_ENTER("wolfSSL_EVP_PKEY_free");
     if (key != NULL) {
+        #ifndef SINGLE_THREADED
         if (wc_LockMutex(&key->refMutex) != 0) {
             WOLFSSL_MSG("Couldn't lock pkey mutex");
         }
+        #endif
 
         /* only free if all references to it are done */
         key->references--;
         if (key->references == 0) {
             doFree = 1;
         }
+        #ifndef SINGLE_THREADED
         wc_UnLockMutex(&key->refMutex);
+        #endif
 
         if (doFree) {
             wc_FreeRng(&key->rng);
@@ -7545,9 +7555,11 @@ void wolfSSL_EVP_PKEY_free(WOLFSSL_EVP_PKEY* key)
                 break;
             }
 
+            #ifndef SINGLE_THREADED
             if (wc_FreeMutex(&key->refMutex) != 0) {
                 WOLFSSL_MSG("Couldn't free pkey mutex");
             }
+            #endif
             XFREE(key, key->heap, DYNAMIC_TYPE_PUBLIC_KEY);
         }
     }