Apply exclude patterns when shoveling into FileList

[hsbt]

FileList#<< pushed the appended entry after resolve and never passed it through excluded_from_list?. A name added after #exclude, or one matching a default ignore pattern such as core or *.bak, stayed in the list even though #include dropped it. The two ways of adding a file disagreed on exclusion.

This filters the appended name through the same excluded_from_list? check that #include and add_matching already rely on, so #<< gains the exclusion semantics of #include. Default ignore patterns now apply to shoveled entries as well, which is a small behavior change worth noting for anyone that relied on #<< bypassing exclusion.

fl = Rake::FileList.new
fl.exclude("abc.c")
fl << "abc.c"
fl.to_a # => [] (previously ["abc.c"])

#637

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