fix(common): OpenSSLCrypto provider API only for OpenSSL 3+

src/common/Cryptography/OpenSSLCrypto.cpp

@@ -17,6 +17,9 @@
 
 #include "OpenSSLCrypto.h"
 #include <openssl/crypto.h> // NOTE: this import is NEEDED (even though some IDEs report it as unused)
+#include <openssl/opensslv.h>
+
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
 #include <openssl/provider.h>
 
 OSSL_PROVIDER* LegacyProvider;
@@ -53,3 +56,10 @@ void OpenSSLCrypto::threadsCleanup()
     OSSL_PROVIDER_unload(DefaultProvider);
     OSSL_PROVIDER_set_default_search_path(nullptr, nullptr);
 }
+
+#else
+
+void OpenSSLCrypto::threadsSetup() {}
+void OpenSSLCrypto::threadsCleanup() {}
+
+#endif