CRYSTAL_PATH not always includes the default libraries paths if user specify $CRYSTAL_PATH manually

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My use case is, i save this really useful snippets write by @asterite to, e.g. ~/Dropbox/common/crystal/lib/meta.cr, then prepend this folder into $CRYSTAL_PATH.

now, i can use those methods defined in meta.cr, like this:

require "meta"

pp! "hello".methods
pp! String.class_methods