Wrap lint calling in a variable.

Set LINT to the obj path, since we need to use the new lint's features
to create .ln files.  We do not want to use the installed version for that,
since that might create files according to the old lint.

This is still a work in progress to clean this all up, but it gets
through buildworld, which was the problem at hand.

usr.bin/xlint/llib/Makefile

@@ -2,6 +2,7 @@
 # $FreeBSD$
 
 LIBS=	llib-lposix.ln llib-lstdc.ln
+LINT=	${.OBJDIR}/../xlint/xlint
 
 all:	${LIBS}
 
@@ -13,9 +14,9 @@ clean cleanall:
 	rm -f ${LIBS}
 
 llib-lposix.ln: llib-lposix
-	lint -Cposix ${.ALLSRC}
+	${LINT} -Cposix ${.ALLSRC}
 
 llib-lstdc.ln: llib-lstdc
-	lint -Cstdc ${.ALLSRC}
+	${LINT} -Cstdc ${.ALLSRC}
 
 .include <bsd.prog.mk>