Fix range check in map_html_tags()
Fix error handling for CRL loading in OpenSSL code
Fix progress bar assertion
Add a configure option to disable assertions

Adds a --disable-assert configure option. We **highly recommend** the
use of this option by distro maintainers so as to ensure a smooth
experience with Wget. Sometimes an assertion may fail even though Wget
continues to work perfectly. In such scenarios, we do not wish for
client installations of Wget to crash. Hence, for a stable experience,
please use the --disable-assert configure flag.
Fix make syntax-check.
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