Check for OPENSSL_VERSION_* definitions before defining

[rdmark]

Description

When using WolfSSL side by side with OpenSSL, the OPENSSL_VERSION_NUMBER and OPENSSL_VERSION_TEXT macros get redefined, triggering compiler warnings. This patch adds definition checks in WolfSSL for these two.

For context, my specific usecase in the Netatalk project we use WolfSSL for DHCAST128 encryption, but still rely on OpenSSL for certain symbols that aren't available in WolfSSL, e.g. CAST_* in openssl/cast.h

Testing

Tested by building WolfSSL against Netatalk.

Checklist

N/A (I think)

[wolfSSL-Bot]

Can one of the admins verify this patch?

[dgarske]

Hi @rdmark ,

I like the addition. I don't see a contributor agreement on file. We can either take this as a feature request or we can get an agreement setup. Are you planning to make additional code contributions? If you'd like to start the agreement process please email support at wolfssl dot com.

Thanks,
David Garske, wolfSSL

[rdmark]

@dgarske Hi, thanks for taking a look at my PR. I shot you an email now regarding the contributor agreement. While I don't have another PR in the pipeline right now, it is not impossible I will in the future.

[douzzer]

superseded by #7971