maint: update deps

deps/curl/docs/libcurl/opts/CURLOPT_SSLENGINE.md

@@ -0,0 +1,74 @@
+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_SSLENGINE
+Section: 3
+Source: libcurl
+See-also:
+  - CURLINFO_SSL_ENGINES (3)
+  - CURLOPT_SSLENGINE_DEFAULT (3)
+  - CURLOPT_SSLKEY (3)
+---
+
+# NAME
+
+CURLOPT_SSLENGINE - SSL engine identifier
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLENGINE, char *id);
+~~~
+
+# DESCRIPTION
+
+Pass a pointer to a null-terminated string as parameter. It is used as the
+identifier for the crypto engine you want to use for your private key.
+
+The application does not have to keep the string around after setting this
+option.
+
+# DEFAULT
+
+NULL
+
+# PROTOCOLS
+
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
+    curl_easy_setopt(curl, CURLOPT_SSLENGINE, "dynamic");
+    res = curl_easy_perform(curl);
+    curl_easy_cleanup(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Only if the SSL backend is OpenSSL built with engine support.
+
+# RETURN VALUE
+
+CURLE_OK - Engine found.
+
+CURLE_SSL_ENGINE_NOTFOUND - Engine not found, or OpenSSL was not built with
+engine support.
+
+CURLE_SSL_ENGINE_INITFAILED - Engine found but initialization failed.
+
+CURLE_NOT_BUILT_IN - Option not built in, OpenSSL is not the SSL backend.
+
+CURLE_UNKNOWN_OPTION - Option not recognized.
+
+CURLE_OUT_OF_MEMORY - Insufficient heap space.