vtls: avoid forward declaration in MultiSSL builds

The MSVC compiler cannot have forward declaration with const and static
variable, causing this error:
```
curl\lib\vtls\vtls.c(417,44): warning C4132: 'Curl_ssl_multi': const object should be initialized
```

Ref: #14276
Closes #14305

diff --git a/lib/vtls/vtls.c b/lib/vtls/vtls.c
index 96e7197d4530260909c4bec1a74b098c50ec8036..e601f4b16ea133469ce6dc8ddd7d9eda9b1a62b8 100644 (file)
--- a/lib/vtls/vtls.c
+++ b/lib/vtls/vtls.c
@@ -413,23 +413,6 @@ int Curl_ssl_init(void)
   return Curl_ssl->init();
 }
 
-#if defined(CURL_WITH_MULTI_SSL)
-static const struct Curl_ssl Curl_ssl_multi;
-#endif
-
-/* Global cleanup */
-void Curl_ssl_cleanup(void)
-{
-  if(init_ssl) {
-    /* only cleanup if we did a previous init */
-    Curl_ssl->cleanup();
-#if defined(CURL_WITH_MULTI_SSL)
-    Curl_ssl = &Curl_ssl_multi;
-#endif
-    init_ssl = FALSE;
-  }
-}
-
 static bool ssl_prefs_check(struct Curl_easy *data)
 {
   /* check for CURLOPT_SSLVERSION invalid parameter value */
@@ -1404,6 +1387,19 @@ static const struct Curl_ssl *available_backends[] = {
   NULL
 };
 
+/* Global cleanup */
+void Curl_ssl_cleanup(void)
+{
+  if(init_ssl) {
+    /* only cleanup if we did a previous init */
+    Curl_ssl->cleanup();
+#if defined(CURL_WITH_MULTI_SSL)
+    Curl_ssl = &Curl_ssl_multi;
+#endif
+    init_ssl = FALSE;
+  }
+}
+
 static size_t multissl_version(char *buffer, size_t size)
 {
   static const struct Curl_ssl *selected;