@Deprecated
    public static boolean useOpenSsl() {
        return tlsEngineType() == TlsEngineType.OPENSSL;
    }
Returns whether the JNI-based TLS support with OpenSSL is enabled. When enabled, Armeria uses OpenSSL
for processing TLS connections. When disabled, the current JVM's default {@link SSLEngine} is used
instead.

<p>This flag is enabled by default for supported platforms. Specify the
{@code -Dcom.linecorp.armeria.useOpenSsl=false} JVM option to disable it.

@deprecated Use {@link #tlsEngineType()} and {@code -Dcom.linecorp.armeria.tlsEngineType=openssl}.
core/src/main/java/com/linecorp/armeria/common/Flags.java