Fix const spec in apps

Fix const spec in apps

This patch fixes several const specifiers
(visible with non-default const-qual warning).

 - Functions like SSL_set_tlsext_host_name takes
   non-cost hostname parameter.

 - packet buffer is read in BIO_read, so it
   cannot be const

The rest is missing const specifiers where casting
to non-cost is not needed.

Signed-off-by: Milan Broz <gmazyland@gmail.com>
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Nikola Pajkovsky <nikolap@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
MergeDate: Wed Feb  4 19:49:15 2026
(Merged from https://github.com/openssl/openssl/pull/29796)