openssl: set FLAG_TRUSTED_FIRST unconditionally #5530
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On some systems, openssl 1.0 is still the default, but it has been patched to
contain all the recent security fixes. As a result of this patching, it is
possible for macro X509_V_FLAG_NO_ALT_CHAINS to be defined, while the previous
behavior of openssl to not look at trusted chains first, remains.
Problem is that curl will fail to verify websites stills serving an expired, intermediate certificate, which happened quite a few times recently: https://www.agwa.name/blog/post/fixing_the_addtrust_root_expiration
Fix it: ensure X509_V_FLAG_TRUSTED_FIRST is always set, do not try to probe for
the behavior of openssl based on the existence of this macro.