FStarC.Util: make sure executable_name and exec_dir point to concrete… #3697
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… paths
When building F* from the repo, the bin/fstar.exe symlink does not work in MacOS due to executable_name being a path with unresolved links, so trying to locate the library fails. This fixes it by using Unix.realpath to canonicalize and resolve the path.
Thanks to @danelahman for reporting and testing.