glob(3) extension

[der Mouse <mouse%Rodents.Montreal.QC.CA@localhost>]

I propose an addition to glob(3): GLOB_HIDE_DOTDIRS, which makes . and
.. vanish when matching wildcards, even if GLOB_PERIOD is set.

Comments?  (I'm going to implement it for my own use, but would find it
convenient to have it in the tree.)

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