Fix traversal of dirs containing troublesome softlinks #1718
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This is bugfix/refactor with no behavior changes. Several operations that look for files in subdirectories would bomb in the presence of recursive/broken links.
A new crate (
den
) with consistent behavior for softlinks across Unixes/Windows should simplify Alire's own code moving forward. We were previously assuming that Windows doesn't support softlinks (and bothGNAT.OS_Lib
andGNATCOLL
still do), but this is not true for recent Windows versions with developer mode enabled (which is the case of GitHub runners).