kconfig: document use of HAVE_*
authorSam Ravnborg <sam@ravnborg.org>
Mon, 28 Jan 2008 20:49:46 +0000 (21:49 +0100)
committerSam Ravnborg <sam@ravnborg.org>
Mon, 28 Jan 2008 22:21:19 +0000 (23:21 +0100)
It has been discussed on lkml several times but we need
it documented as this is new stuff.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

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