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

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@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/Kconfig

@@ -301,6 +301,7 @@ config SYN_COOKIES
 
 config INET_AH
 	tristate "IP: AH transformation"
+	depends on INET
 	select XFRM
 	select CRYPTO
 	select CRYPTO_HMAC
@@ -313,6 +314,7 @@ config INET_AH
 
 config INET_ESP
 	tristate "IP: ESP transformation"
+	depends on INET
 	select XFRM
 	select CRYPTO
 	select CRYPTO_HMAC
@@ -326,6 +328,7 @@ config INET_ESP
 
 config INET_IPCOMP
 	tristate "IP: IPComp transformation"
+	depends on INET
 	select XFRM
 	select INET_TUNNEL
 	select CRYPTO
@@ -338,6 +341,7 @@ config INET_IPCOMP
 
 config INET_TUNNEL
 	tristate "IP: tunnel transformation"
+	depends on INET
 	select XFRM
 	---help---
 	  Support for generic IP tunnel transformation, which is required by