libcrypt: Drop inclusion of libutil.h

This was rendered obsolete in 2012 by a0ee974f0b, since auth_getval
was the only reason the header was included.

MFC after:	1 week

lib/libcrypt/Makefile

@@ -20,7 +20,7 @@ SRCS=		crypt.c misc.c \
 MAN=		crypt.3
 MLINKS=		crypt.3 crypt_get_format.3 crypt.3 crypt_r.3 \
 		crypt.3 crypt_set_format.3
-CFLAGS+=	-I${SRCTOP}/lib/libmd -I${SRCTOP}/lib/libutil \
+CFLAGS+=	-I${SRCTOP}/lib/libmd \
 		-I${SRCTOP}/sys/crypto/sha2
 
 # Pull in the strong crypto, if it is present.

lib/libcrypt/crypt.c

@@ -32,7 +32,6 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/types.h>
 
-#include <libutil.h>
 #include <string.h>
 #include <unistd.h>