* add an extra argument to the dir lookup functions to say whether we

should look in the current directory.
* refactor include files treatment to have a separate function to look
for an include.
* use both pieces to make sure system includes do not get looked up
in the current directory unless everything else fails.

This is != from the netbsd solution to the same problem, which stuffs
`magic' entries into filepaths to say whether dot should be looked at
first or last.

feature requested by matthieu@.
okay matthieu@

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