Nice kconfig hack

[Lauri Kasanen]

Hi

Linus asked for a better way to handle the kconfig values:
https://plus.google.com/102150693225130002912/posts/9gntjh57dXt

The solution is rather neat, maybe it could save generating a few
thousand included lines in busybox too:

#define is_set(macro) is_set_(macro)
#define macrotest_1 ,
#define is_set_(value) is_set__(macrotest_##value)
#define is_set__(comma) is_set___(comma 1, 0)
#define is_set___(_, v, ...) v

- Lauri

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