Returns a string usable in Dir.glob to
match all requirable paths for this spec.
# File lib/rubygems/basic_specification.rb, line 277
def lib_dirs_glob
dirs = if self.require_paths.size > 1 then
"{#{self.require_paths.join(',')}}"
else
self.require_paths.first
end
"#{self.full_gem_path}/#{dirs}".dup.untaint
end