Only check unsupported error for OpenSSL 3+ - didn't exist before then

Author: pimterry

src/crypto/crypto_context.cc

@@ -1149,12 +1149,14 @@ void SecureContext::LoadPKCS12(const FunctionCallbackInfo<Value>& args) {
     // TODO(@jasnell): Should this use ThrowCryptoError?
     unsigned long err = ERR_get_error();  // NOLINT(runtime/int)
 
+#if OPENSSL_VERSION_MAJOR >= 3
     if (ERR_GET_REASON(err) == ERR_R_UNSUPPORTED) {
       // OpenSSL's "unsupported" error without any context is very
       // common and not very helpful, so we override it:
       return THROW_ERR_CRYPTO_UNSUPPORTED_OPERATION(
           env, "Unsupported PKCS12 PFX data");
     }
+#endif
 
     const char* str = ERR_reason_error_string(err);
     str = str != nullptr ? str : "Unknown error";