netfilter: conntrack: remove CONFIG_NF_CONNTRACK check from nf_conntrack_acct.h.

There is a superfluous `#if IS_ENABLED(CONFIG_NF_CONNTRACK)` check
wrapping some function declarations.  Remove it.
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/net/netfilter/nf_conntrack_acct.h

@@ -65,11 +65,9 @@ static inline void nf_ct_set_acct(struct net *net, bool enable)
 #endif
 }
 
-#if IS_ENABLED(CONFIG_NF_CONNTRACK)
 void nf_conntrack_acct_pernet_init(struct net *net);
 
 int nf_conntrack_acct_init(void);
 void nf_conntrack_acct_fini(void);
-#endif /* IS_ENABLED(CONFIG_NF_CONNTRACK) */
 
 #endif /* _NF_CONNTRACK_ACCT_H */