GNU tar in the base system is now called "gtar"

"tar" is now just a link to "gtar".

This lays the groundwork for an orderly migration
from GNU tar to some other tar.  (First, we introduce
the new tar program, then we migrate the 'tar' name,
then we remove gtar, with intervals of months between
these steps.)

Approved by:	gordon

gnu/usr.bin/tar/Makefile

@@ -3,7 +3,12 @@
 TARDIR=	${.CURDIR}/../../../contrib/tar
 .PATH: ${TARDIR}/lib ${TARDIR}/src
 
-PROG=	tar
+PROG=	gtar
+
+.if !defined(WITH_BSDTAR)
+LINKS=  ${BINDIR}/gtar ${BINDIR}/tar
+MLINKS= gtar.1 tar.1
+.endif
 
 SUBDIR=	doc
 
@@ -18,4 +23,9 @@ SRCS+=	buffer.c compare.c create.c delete.c extract.c incremen.c list.c \
 
 CFLAGS+= -DHAVE_CONFIG_H -I${.CURDIR} -I${TARDIR}/lib -I${TARDIR}/src
 
+# "Rename" tar.1 to gtar.1 so that we can install gtar.1 with
+# tar.1 as an optional link (rather than vice versa)
+gtar.1: tar.1
+	cp $(.CURDIR)/tar.1 $(.TARGET)
+
 .include <bsd.prog.mk>