x509: sort stacks before finds

x509: sort stacks before finds

x509_trust.c, x509_vpm.c and v3_lib.c don't have a lock for their sorts.
This is no worse than the existing code which sorted silently without locks.

Addition is quadratic time in by_dir.c and v3_purp.c.  However, this
is an improvement over the older O(n^2 log n) code where each find also
sorted the stack.  Also note that v3_purp.c is limited to a maximum of
10 items, so quadratic behaviour isn't terrible.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Todd Short <todd.short@me.com>
(Merged from https://github.com/openssl/openssl/pull/20842)