[pkgsrc/trunk]: pkgsrc/mk/extract extract.mk: Fix comment about nbtar

[gdt <gdt%pkgsrc.org@localhost>]

details:   https://anonhg.NetBSD.org/pkgsrc/rev/386537353062
branches:  trunk
changeset: 412835:386537353062
user:      gdt <gdt%pkgsrc.org@localhost>
date:      Thu Mar 12 16:55:31 2020 +0000

description:
extract.mk: Fix comment about nbtar

Maybe long ago nbtar was pkgsrc's pax-as-tar, but now this is just
${TOOL_PLATFORM.tar} which might be anything.

diffstat:

 mk/extract/extract.mk |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (20 lines):

diff -r 41727f8f1c38 -r 386537353062 mk/extract/extract.mk
--- a/mk/extract/extract.mk     Thu Mar 12 16:43:36 2020 +0000
+++ b/mk/extract/extract.mk     Thu Mar 12 16:55:31 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: extract.mk,v 1.38 2019/05/07 19:36:44 rillig Exp $
+# $NetBSD: extract.mk,v 1.39 2020/03/12 16:55:31 gdt Exp $
 #
 # The following variables may be set by the package Makefile and
 # specify how extraction happens:
@@ -31,7 +31,9 @@
 #    EXTRACT_USING specifies the tool used to extract tar/ustar-format
 #      archives when using EXTRACT_CMD_DEFAULT.  The possible values are
 #      "bsdtar", "gtar", "nbtar", and "pax".
-#      By default, we use the "nbtar" tool (pkgsrc's pax-as-tar).
+#      By default, we use the "nbtar", which means the value of
+#      ${TOOL_PLATFORM.tar}, which is typically an arbitrary
+#      implementation already found on the platform.
 #
 #    EXTRACT_ELEMENTS is a list of files within the distfile to extract
 #      when using EXTRACT_CMD_DEFAULT.  By default, this is empty, which