[IPSEC] Make ah4/esp4/ipcomp depend on INET

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

As it is someone could disable INET and still enable ah4/esp4/ipcomp.
This patch adds the dependency on INET to prevent this.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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