util::http should provide enough fallback via curl already without targeting specific Naviserver versions, use other fallbacks only when no implementation is available
Fix webserver version check using 'apm_version_names_compare' for rc versions.
Between 4.99.6 and 4.99.20rc1, for example, 'apm_version_names_compare' will consider the latter to be the lowest. As this is not the expected behavior for webserver version check, this patch just removes the rc part of the version before comparing in the few cases where this is done, and should be removed if the behavior changes in the future.