kconfig: error out if recursive dependencies are found

Sample:
config FOO
	bool "This is foo"
	depends on BAR

config BAR
	bool "This is bar"
	depends on FOO

This will result in following error message:
error: found recursive dependency: FOO -> BAR -> FOO

And will then exit with exit code equal 1 so make will stop.
Inspired by patch from: Adrian Bunk <[email protected]>

Signed-off-by: Sam Ravnborg <[email protected]>
Cc: Adrian Bunk <[email protected]>
Cc: Roman Zippel <[email protected]>

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