wolfssl: remove now deprecated compatibility code

wolfssl: remove now deprecated compatibility code

Mainly that NO_X509_CHECK_HOST is causing certificate validation issues
in some setups:

 root@OpenWrt:/# wget https://www.google.com
 Downloading 'https://www.google.com'
 Connecting to 172.217.23.196:443
 Connection error: Server hostname does not match SSL certificate

but instead of spending time on fixing it, I've simply decided to remove
it as we're now on wolfSSL 4.5.0 and those symbols should be avaialable
so no symbol detection and handling should be needed anymore.

Signed-off-by: Petr Štetiar <ynezz@true.cz>