Remove ${DESTDIR} from _PATH_TCSHELL, it is call path, not install path

Add gethost to build-tools to help cross-building

bin/csh/Makefile

@@ -11,7 +11,7 @@ TCSHDIR= ${.CURDIR}/../../contrib/tcsh
 
 PROG=	csh
 SUBDIR= nls
-DFLAGS=	-D_PATH_TCSHELL='"${DESTDIR}/bin/${PROG}"'  
+DFLAGS= -D_PATH_TCSHELL='"/bin/${PROG}"'
 CFLAGS+= -I${TCSHDIR} -I${.CURDIR} -I. ${DFLAGS}
 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 \
@@ -45,6 +45,8 @@ CLEANFILES= ${GENHDRS} gethost csh.1
 csh.1: tcsh.man
 	ln -sf ${.ALLSRC} ${.TARGET}
 
+build-tools: gethost
+
 gethost: gethost.c sh.err.h tc.const.h sh.h
 	@rm -f ${.TARGET}
 	${CC} -o gethost ${LDFLAGS} ${CFLAGS} ${TCSHDIR}/gethost.c