Update to tcsh 6.18.01.

bin/csh/Makefile

@@ -18,7 +18,7 @@ DFLAGS= -D_PATH_TCSHELL='"/rescue/${PROG}"'
 DFLAGS= -D_PATH_TCSHELL='"/bin/${PROG}"'
 .endif
 CFLAGS+= -I. -I${.CURDIR} -I${TCSHDIR} ${DFLAGS}
-WARNS?=	0
+WARNS?=	1
 SRCS=	sh.c sh.dir.c sh.dol.c sh.err.c sh.exec.c sh.char.c \
 	sh.exp.c sh.file.c sh.func.c sh.glob.c sh.hist.c sh.init.c \
 	sh.lex.c sh.misc.c sh.parse.c sh.print.c sh.proc.c sh.sem.c \
@@ -116,10 +116,10 @@ gethost: gethost.c sh.err.h tc.const.h sh.h
 	${CC} -o gethost ${LDFLAGS} ${CFLAGS:C/-DHAVE_ICONV//} \
 	    ${TCSHDIR}/gethost.c
 
-tc.defs.c: gethost ${.CURDIR}/host.defs
+tc.defs.c: gethost ${TCSHDIR}/host.defs
 	@rm -f ${.TARGET}
 	@echo "/* Do not edit this file, make creates it */" > ${.TARGET}
-	./gethost ${.CURDIR}/host.defs >> ${.TARGET}
+	./gethost ${TCSHDIR}/host.defs >> ${.TARGET}
 
 ed.defns.h: ed.defns.c
 	@rm -f ${.TARGET}