err/err.c: add err_clear_last_constant_time.
Expected usage pattern is to unconditionally set error and then wipe it if there was no actual error. Reviewed-by:Richard Levitte <levitte@openssl.org> Reviewed-by:
Matt Caswell <matt@openssl.org> (cherry picked from commit f658a3b6) Resolved conflicts: crypto/err/err.c (Merged from https://github.com/openssl/openssl/pull/7735)
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