openssl: OpenSSL master added const to more APIs

[bagder]

Tested with OpenSSL master commit 2b5bb6148ff0ea44d4aa977c

[Copilot]

Pull request overview

This PR adapts the curl OpenSSL TLS backend (lib/vtls/openssl.c) to compile cleanly against OpenSSL master, which is adding const qualifiers to several APIs. The changes add const to local variable declarations and function parameters to match the updated signatures.

Changes:

• const ASN1_OBJECT *obj in X509V3_ext to match X509_EXTENSION_get_object's now-const return type
• const ASN1_STRING * cast for ASN1_STRING_print argument in X509V3_ext
• const X509_NAME *a parameter in x509_name_oneline to match updated X509_NAME_print_ex requirements
• const X509_NAME *name and const ASN1_STRING *tmp in ossl_verifyhost to match updated return types of X509_get_subject_name and X509_NAME_ENTRY_get_data

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