[Click] Large numbers of elements problem.

[Jason Park]

Hi.

With large numbers of elements, I have got click linuxmodule panic.
It seems that the recursive call of lexer makes stack overflow.
I attached a patch, I think it can solve panic while installing click
config.

But, in addition to lexer, there are recursive calls may be fixed.
(i.e. click_qsort_subroutine)

I'm using linux-2.6.16.22 with 8kb stack size && frame pointers.

Jason Park.
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