kconfig: nuke LKC_DIRECT_LINK cruft

This interface is not (and has never been ?) used by any frontend, just get rid
of it.

Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>

scripts/kconfig/lkc.h

@@ -21,12 +21,7 @@ static inline char *bind_textdomain_codeset(const char *dn, char *c) { return c;
 extern "C" {
 #endif
 
-#ifdef LKC_DIRECT_LINK
 #define P(name,type,arg)	extern type name arg
-#else
-#include "lkc_defs.h"
-#define P(name,type,arg)	extern type (*name ## _p) arg
-#endif
 #include "lkc_proto.h"
 #undef P